\\n\\n
Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\\n\\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'IntechOpen is proud to announce that 191 of our authors have made the Clarivate™ Highly Cited Researchers List for 2020, ranking them among the top 1% most-cited.
\n\nThroughout the years, the list has named a total of 261 IntechOpen authors as Highly Cited. Of those researchers, 69 have been featured on the list multiple times.
\n\n\n\nReleased this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\n\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
\n'}],latestNews:[{slug:"intechopen-partners-with-ehs-for-digital-advertising-representation-20210416",title:"IntechOpen Partners with EHS for Digital Advertising Representation"},{slug:"intechopen-signs-new-contract-with-cepiec-china-for-distribution-of-open-access-books-20210319",title:"IntechOpen Signs New Contract with CEPIEC, China for Distribution of Open Access Books"},{slug:"150-million-downloads-and-counting-20210316",title:"150 Million Downloads and Counting"},{slug:"intechopen-secures-indefinite-content-preservation-with-clockss-20210309",title:"IntechOpen Secures Indefinite Content Preservation with CLOCKSS"},{slug:"intechopen-expands-to-all-global-amazon-channels-with-full-catalog-of-books-20210308",title:"IntechOpen Expands to All Global Amazon Channels with Full Catalog of Books"},{slug:"stanford-university-identifies-top-2-scientists-over-1-000-are-intechopen-authors-and-editors-20210122",title:"Stanford University Identifies Top 2% Scientists, Over 1,000 are IntechOpen Authors and Editors"},{slug:"intechopen-authors-included-in-the-highly-cited-researchers-list-for-2020-20210121",title:"IntechOpen Authors Included in the Highly Cited Researchers List for 2020"},{slug:"intechopen-maintains-position-as-the-world-s-largest-oa-book-publisher-20201218",title:"IntechOpen Maintains Position as the World’s Largest OA Book Publisher"}]},book:{item:{type:"book",id:"1760",leadTitle:null,fullTitle:"The Role of Osteotomy in the Correction of Congenital and Acquired Disorders of the Skeleton",title:"The Role of Osteotomy in the Correction of Congenital and Acquired Disorders of the Skeleton",subtitle:null,reviewType:"peer-reviewed",abstract:"This book demonstrates specific osteotomy techniques from the skull to the hallux. The role of osteotomy in the correction of deformity is under appreciated in part because of the ubiquitous nature of joint replacement surgery. It should be remembered, however, that osteotomy has a role to play in the correction of deformity in the growing child, the active young adult, and patients of any age with post-traumatic deformity limiting function and enjoyment of life.\nIn this text we bring you a number of papers defining specific problems for which osteotomy is found to be an effective and lasting solution. I hope you find it useful.",isbn:null,printIsbn:"978-953-51-0495-7",pdfIsbn:"978-953-51-4302-4",doi:"10.5772/2196",price:139,priceEur:155,priceUsd:179,slug:"the-role-of-osteotomy-in-the-correction-of-congenital-and-acquired-disorders-of-the-skeleton",numberOfPages:306,isOpenForSubmission:!1,isInWos:1,hash:"9661cdebd682842816ac472a9330e6eb",bookSignature:"James P. Waddell",publishedDate:"April 11th 2012",coverURL:"https://cdn.intechopen.com/books/images_new/1760.jpg",numberOfDownloads:103377,numberOfWosCitations:1,numberOfCrossrefCitations:3,numberOfDimensionsCitations:16,hasAltmetrics:0,numberOfTotalCitations:20,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"May 23rd 2011",dateEndSecondStepPublish:"June 20th 2011",dateEndThirdStepPublish:"October 25th 2011",dateEndFourthStepPublish:"November 24th 2011",dateEndFifthStepPublish:"March 23rd 2012",currentStepOfPublishingProcess:5,indexedIn:"1,2,3,4,5,6,8",editedByType:"Edited by",kuFlag:!1,editors:[{id:"112781",title:"Prof.",name:"James",middleName:null,surname:"Waddell",slug:"james-waddell",fullName:"James Waddell",profilePictureURL:"https://mts.intechopen.com/storage/users/112781/images/3680_n.jpg",biography:"Dr. James Waddell was born in Alberta and graduated from the University of Alberta Medical School in 1967. He did his postgraduate training in orthopaedic surgery at the University of Toronto and assumed a staff position at St. Michael’s Hospital in 1973. \n\nHe has occupied a number of positions at St. Michael’s Hospital including Surgeon-in-Chief and Medical Director of the Trauma Program; he completed 10 years as the Professor & Chairman, Division of Orthopaedic Surgery at University of Toronto in June of 2006. He has also occupied a number of positions in the Canadian Orthopaedic Association including President. He has completed a 10 year term as the Co-Editor of the Canadian Journal of Surgery. \n\nHe is currently the Chair of the Expert Panel for Orthopaedic Surgery for the Province of Ontario and the Coordinator for the National Action Network for the Bone & Joint Decade in Canada. He also is the Co-Chair of the National Hip and Knee Knowledge Translation Network and the Board Chair for the Canadian Orthopaedic Foundation.",institutionString:null,position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"1",totalChapterViews:"0",totalEditedBooks:"1",institution:{name:"St. Michael's Hospital",institutionURL:null,country:{name:"Canada"}}}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"1144",title:"Craniofacial Surgery",slug:"craniofacial-surgery"}],chapters:[{id:"35329",title:"Surgery of the Bony and Cartilaginous Vault in Rhinoplasty",doi:"10.5772/36520",slug:"surgery-of-the-bony-and-cartilaginous-vault",totalDownloads:5651,totalCrossrefCites:0,totalDimensionsCites:0,signatures:"Pavel Dolezal",downloadPdfUrl:"/chapter/pdf-download/35329",previewPdfUrl:"/chapter/pdf-preview/35329",authors:[{id:"108647",title:"Dr.",name:"Pavel",surname:"Doležal",slug:"pavel-dolezal",fullName:"Pavel Doležal"}],corrections:null},{id:"35330",title:"Le Fort I Osteotomy for Maxillary Repositioning and Distraction Techniques",doi:"10.5772/37211",slug:"le-fort-i-osteotomy-for-maxillary-repositioning-and-distraction",totalDownloads:43164,totalCrossrefCites:2,totalDimensionsCites:10,signatures:"Antonio Cortese",downloadPdfUrl:"/chapter/pdf-download/35330",previewPdfUrl:"/chapter/pdf-preview/35330",authors:[{id:"111774",title:"Prof.",name:"Antonio",surname:"Cortese",slug:"antonio-cortese",fullName:"Antonio Cortese"}],corrections:null},{id:"35331",title:"Quality Control of Reconstructed Sagittal Balance for Sagittal Imbalance",doi:"10.5772/37713",slug:"quality-control-of-reconstructed-sagittal-balance-for-sagittal-imbalance",totalDownloads:2283,totalCrossrefCites:0,totalDimensionsCites:0,signatures:"Kao-Wha Chang",downloadPdfUrl:"/chapter/pdf-download/35331",previewPdfUrl:"/chapter/pdf-preview/35331",authors:[{id:"114023",title:"Dr.",name:"Kao-Wha",surname:"Chang",slug:"kao-wha-chang",fullName:"Kao-Wha Chang"}],corrections:null},{id:"35332",title:"Pelvic and Hip Osteotomies in Children",doi:"10.5772/37956",slug:"pelvic-and-hip-osteotomy-in-children",totalDownloads:6266,totalCrossrefCites:0,totalDimensionsCites:0,signatures:"I. 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Currently, Dr. Whizar-Lugo works as anesthesiologist at Lotus Med Group, and belongs to the Institutos Nacionales de Salud as associated researcher. He has published many works on anesthesia, pain, internal medicine, and critical care, edited four books, and given countless conferences in congresses and meetings around the world. He has been a member of various editorial committees for anesthesiology journals, is past chief editor of the journal Anestesia en México, and is currently editor-in-chief of the Journal of Anesthesia and Critical Care. 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Sánchez Muñoz-Torrero",authors:[{id:"91142",title:"Prof.",name:"Juan Francisco",middleName:null,surname:"Sánchez Muñoz-Torrero",fullName:"Juan Francisco Sánchez Muñoz-Torrero",slug:"juan-francisco-sanchez-munoz-torrero"}]},{id:"35466",title:"Selected Algorithms of Computational Intelligence in Gastric Cancer Decision Making",slug:"selected-algorithms-of-computational-intelligence-in-cancer-surgery-decision-making",signatures:"Elisabeth Rakus-Andersson",authors:[{id:"113450",title:"Dr",name:null,middleName:null,surname:"Rakus-Andersson",fullName:"Rakus-Andersson",slug:"rakus-andersson"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"67648",title:"Lead-Free Hybrid Perovskite Light-Harvesting Material for QD-LED Application",doi:"10.5772/intechopen.86836",slug:"lead-free-hybrid-perovskite-light-harvesting-material-for-qd-led-application",body:'Organic-inorganic perovskite light harvesting materials have attracted passionate interest in past few years and raised as one of the most promising solar cells with power conversion efficiency up to 23% as well as excellent performance in LED display devices with high color gamut and color purity [1]. For the photovoltaic (PV) application, perovskite materials were first used in 2009 and for QDs LED applications, perovskite material was used firstly in 2014 [2]. Perovskite-based devices are solution processable that makes it cost-effective and helps in large scale production. Presently, such kind of perovskite solar cells is now comparable to the commercially available solar cells including, silicon, CdTe, CuInGaSe, and GaAs [3]. Perovskite quantum dots (PQDs) also are the most research centered topic in the field of nano-materials and colloidal QDs due to its excellent optical behavior as explained earlier [4].
After long research and development, semiconductor QDs (CdSe, CdZnSe, InP, etc.) and OLEDs have emerged as the leading technologies in the field of display devices [3]. OLEDs have lit pixels, less energy consuming properties, superior contrast, and wider viewing angles. However, synthesis and fabrication process of OLEDs are very complicated that raise the price of devices. On the other hand, PQDs possess tunable, narrow band emission and high PLQY that significantly improve the performance in both EL and PL devices as explained earlier. Existing CdSe and InP QDs have taken decades to be suitable as the robust candidates for displays. Samsung QLED TVs have been in the forefront serving the premium market along with Chinese brands, TCL and Hisense. Samsung Display is building a pilot production facility for QD OLED, which will start production in 2019. Most research is centered on PQDs due to their high photoluminescence (PLQY), tunable band gaps, and narrow emission wavelength. With quantum confinement effects, the emission of PQDs can be controlled with size and ingredients. Hence, PQDs are useful in photovoltaic cells, laser applications, light-emitting diodes (LEDs), and bio-imaging. Promising color purity and emission tunability of QDs make them promising contenders for next-generation displays as a light converter (white-light LEDs) and active-mode QD-LEDs (QLEDs) [3, 5]. Additionally, PQDs work faster than other QDs due to the absence of a deep state, where the electron-hole pair does not immediately revert to its ground state. In this context, PQDs have become promising candidates for the next-generation of w-LEDs for lighting and other display applications [6, 7, 8, 9]. After the discovery of PQDs, more than 7000–8000 peer-reviewed literatures have been published. The fast rate of scientific research publication reveals the interest of the research community in the PQDs topic. Besides excellent performances of PQD technology, some challenges restrict the lead-containing perovskite materials for commercialization. Lead halide perovskite both bulk as well as nanoparticles/QDs are soft and very sensitive with humidity, moisture, light, air, temperature, etc. [10]. Therefore, the most apparent work necessity is to develop the new synthesis routes and new approaches of their more stabilization concerning ambient conditions, water, light, and temperature. Bromide-based perovskite has excellent performance, but the major shortcoming is the stability and presence of toxic element Pb. In this regards, a more in-depth understanding of the mechanism on the radiative and nonradiative recombination is necessarily required [11, 12].
Thus it is an open question that does the organic-inorganic perovskite-based device industry fabrication comes soon? The answer may be controversial because research community will say yes while some will say no because of the toxicity of Pb and long term stability of the materials. According to the U. S. EPA, the maximum amount of Pb2+ in air and water should not be more than 0.1 μg L−1 and 15 μg L−1 respectively [13]. Hence mass production of pure Pb-based perovskite may pollute the Earth due to its toxicity, long degradation lifetime and easy solubility in water. Therefore, we need to develop a new approach to explore environmental friendly Pb free or limited amount of Pb-based perovskite materials for optoelectronic applications. Thus these two main drawbacks of perovskite material restrict it in commercialization. Hence, the demand for nontoxic element-based perovskite materials continues to grow in the past few years [14]. Among these nontoxic alternatives, divalent tin cation has been considered as a right candidate in replacing Pb2+, and the application of tin-halide perovskites in optoelectronic devices has also been investigated. However, Sn2+ undergoes facile oxidation to its tetravalent state (Sn4+), creating a high defect density in the perovskite lattice. These defects would generate trap states in the middle of the band gap, leading to rapid non-radiative relaxation of the exciton. The highest PLQY value of tin-based perovskite nanomaterials can only reach 6.4%, which is still far inferior to the lead-based perovskite nanomaterials (~84%) [15]. Potential applications of Sn-based perovskite material in optoelectronic applications, significant efforts have been made recently to improve the photoluminescence properties of tin perovskite-based nanomaterials. Besides Sn, in place of Pb2+, Zn2+, Mn2+, Ge2+, Cu2+, and Bi3+ already have been investigated for less lead of lead-free perovskite materials for versatile applications. However, in the case of organic-inorganic halide PQDs, there is very less work reported and some research work based on Pb2+ substitution in only inorganic CsPbX3 perovskite systems are going on, and this will be the main focus for the present chapter.
Perovskites structure derives from the crystal structure of titanium calcium oxide (CaTiO3). This was the first discovered perovskite material in the year 1839 by German mineralogist Gustav Rose and structure of perovskite material was studied by Russian mineralogist Lev A. Perovski [16]. After this discovery, a huge amount of perovskite materials have been found from natural resources and as well as synthesized in the lab also. So perovskite materials can be categorized mainly into two categories, one is based on oxides (oxygen anion) and another based on halides (halogen anions). On the basis of this categorization, perovskite materials adopt ABO3 and ABX3 chemical formula, where A and B are the cations and X is halogens such as I, Br, Cl, or mixed halides. ABO3 structured perovskite is generally used for thermoelectric, superconductive and ferromagnetic applications which were discovered in the 18th century. On the other hand, halide-based perovskite material; CsPbX3 was first reported in 1958, and CH3NH3PbX3-based perovskite was seen in 1978. Thus ABX3 perovskite further can be categorized into two subparts, pure inorganic halide perovskite, and organic-inorganic halide perovskite. Mitzi et al. have first time reported the excitonic property of halide perovskites for light-emitting diodes (LEDs) and thin film transistors in the year 1990 [17]. Nowadays, most extensively studied materials are ABX3 structured perovskite semiconductor due to its excellent properties. In ABX3 chemical formula, A, belongs to monovalent inorganic cation such as K+, Rb+, Cs+ or monovalent organic cation like ethylammonium (CH3CH2NH3+, EA), methylammonium (CH3NH3+, MA+), formamidinium ((CH(NH2)+2), FA), B-site stands for divalent cation Pb2+, Sn2+, Ge2+, Ca2+, Sr2+, Ba2+ and X is anion (I−, Br− and Cl−). The properties of perovskite material can be easily tuned by changing the A, B or X site in ABX3 structure [18]. Generally, perovskite materials have cubic structure consists of close-packed AX3 sub-lattice with divalent B-site cations within the six-fold coordinated cavities. B-X bonding of perovskite governs the electronic behavior of perovskite semiconductors while A cation has no direct role for the electronic properties. But the size of the A cation may cause the distortions in symmetry of the material. Besides the cubic phase, perovskite has tetragonal and orthorhombic phase also. For example, MAPbI3 has a tetragonal structure while MAPbBr3 and MAPbCl3 have a cubic structure at room temperature. The symmetry of MAPbI3 perovskite also depends on the temperature and symmetry increases with increase in temperature such as, at a lower temperature it has octahedral symmetry, and at room temperature to (162.2–327 K) has tetragonal white at a higher temperature above 178.8 K shows cubic phase. FAPbI3 perovskite has higher symmetry than MA-based perovskites hence has been most widely investigated [19]. FAPbI3 perovskite has nearly cubic structure at room temperature and inert atmosphere. At open atmosphere, FA shows its yellow phase that is non-perovskite phase of this material, and it is not useful for optoelectronic devices because of the high band gap. This is the only drawback with FA material otherwise FA-based perovskite would exceed those of MA [20].
Every ABX3 structure cannot be a perovskite phase. There is some fixed criteria for the existence of perovskite structure: (1) charge neutrality: that means the charges of cation and anion should be equal. For example, for ABX3 structure, A and B cations have 1+, and 2+ charges (total = 3+) and X anion has 3− charges. So both cation and anion have equal costs, i.e., N(A) + N(B) = 3 N(X), here N belongs to the valence of the A, B and X ions; (2) the Goldschmidt tolerance factor, t and (3) octahedral factor μ. t and μ are the most potent factor that decides the existence and structure of the perovskite material. Tolerance factor t and octahedral factor μ are defined as the following equation:
where rA, rB, and rX are the ionic radii of A, B, and X, respectively. For the perovskite structure, the value of t and μ must be lies between given limit; 0.89 < t < 1.11 and 0.442 < μ < 0.895 [21]. Thus from the above formula, it is clear that the size of the A, B and X ions play an essential role for the perovskite materials. These days the Goldschmidt tolerance factor concept is beneficial for the finding the lead-free perovskite materials based on the ionic radii of implicated ions. Beside B-site replacement, there are too many possibilities of the other ion positions such as A as well as X-site. On the basis of this concept, Kieslich and co-workers have theoretically found out more than 600 hypothetical perovskites that have not been reported yet [22]. Such kind of study can help develop less lead of lead-free perovskite materials on the practical level for commercialization.
Organic-inorganic perovskite materials demonstrate a strong optical absorption and bandgap tuning, long diffusion length, high charge carrier mobility, ambipolar charge transport and high tolerance of defects. Strong light absorbing properties of the material ideally suited for solar cell devices. On the other hand, band tuning properties and a wide range of light emission in the visible range with narrow emission bandwidth (FWHM) suitable for the light emitting devices. Organic-inorganic perovskite materials have sharp optical band edge that indicates the direct bandgap and minimal disordered materials [23]. The bandgap of perovskite material can be controlled by their chemical compositions and crystallite size. For example, CH3NH3PbI3 (red emission), CH3NH3PbBr3 (green emission) and CH3NH3PbCl3 (blue emission) hybrid perovskites have band gap of 1.55, 2.3 and 3.1 eV, respectively [24].
The band gap energy levels of hybrid perovskite are determined by an anti-bonding hybrid state between the cation B-s and anion X-p orbitals. This state is related to the valance band maxima and conduction band minimum. Thus due to their unique ABX3 structure and compositional flexibility, optical properties can be tuned by varying elements at each site. The change in I/Br ratio in CH3NH3PbX3 perovskite can modify the bandgap from 1.55 to 2.3 eV, i.e., PL emission can be tuned red, orange and yellow. This band gap tuning mechanism is due to the hybridization of p and s orbitals such as Br-4p orbital is overlapped with the I-5p orbital and the Pb-6 s orbital. Similarly, with varying the concentration of Cl/Br, we can tune bandgap from 2.3 to 3.1 eV for hybrid perovskites [25]. Another approach is tuning of the band gap in perovskite structure is substitution of (CH3NH3)+ site (A) by Cs+, Rb+ or mixing of both Cs/other alkyl-ammonium cations. With changing the A cation, the bond length with B and X site is also changed that is responsible for the band gap tuning. CsPbI3, CH3NH3PbI3 and FAPbI3 has band gap of 1.73, 1.55 and 1.48 eV, respectively [26]. So from these values, we can see that the band gap of the material decreases with increasing the cation size. Besides A and X site, the band gap energy can be tuned with changing the Pb2+ (B) from other divalent cations like Sn2+, Mn2+, Cd2+, etc. [26].
Depending on the particle size, dimensions and morphology hybrid perovskite materials show different optical energy gap than their bulk counterparts due to their quantum confinement effect. For traditional nano-materials, quantum confinement effect has been widely studied. In recent times, the development of size-controlled perovskite QDs has enabled exhaustive research and developments of quantum confinement effect in QDs. Size of perovskite QDs can be controlled or tuned by ligand OLA. Friend et al. have studied on the size-dependent photon emission from CH3NH3PbBr3 PQDs, where the particle size and the PL emission peak could be tuned by varying the concentration of the perovskite precursors [27]. Quantum confinement effects have also been reported by Kovalenko group in all inorganic CsPbBr3 PQDs. They found that, with a decrease in the diameter of particle size from 11.8 to 3.8 nm, the PL emission peak gradually blue-shifted from 512 to 460 nm [28]. The thickness of the QDs also responsible for the band gap tuning. Thus trough band gap tuning, multi-colored LEDs and white LED can be formed by simple and easy way.
Perovskite quantum dots are considered as the most capable aspirant to the next generation of optoelectronic devices and solar cells technology. But the presence of toxicity due to Pb restricts the commercialization. Hence, currently, most of the research is going on less lead or Pb-free perovskites. The nontoxic and environmentally free perovskite can be prepared by substituting Pb with nontoxic elements that can be achieved through two approaches, i.e., homovalent and heterovalent substitution. Homovalent elements for lead substitution with an isovalent cation such as Sn2+, Mn2+, Cd2+, Zn2+, etc. while heterovalent are aliovalent cations like Bi3+, Sb3+. In this work, we will only discuss homovalent cation substitution of PQDs.
For the Pb-free perovskite materials, many homovalent elements with +2 stable oxidation states can be used. For example, the group- 14 elements Sn2+ and Ge2+, i.e., the same group of Pb2+ can be the best choice for lead substitution. Beside this, transition metals as Cd2+, Mn2+, Fe2+, Cu2+ and Zn2+; alkaline-earth metals such as Ba2+, Sr2+ and Ca2+; rare-earth elements like Eu2+, Yb2+ can be considered for the Pb-free perovskites [29]. Theoretically, these Pb-substitutes are perfect for perovskite structure according to the tolerance factor calculations. But some elements like Ba, Sr, and Ca have a large band gap, so these are not suitable for semiconducting materials. However, working with Cu and Zn in ambient condition will be difficult. In recent years, Sn2+ and Mn2+ are the promising candidates for homovalent substitution in perovskite quantum dots.
The most suitable Pb-substitute is Sn2+ for lead-free perovskite because of the around same ionic radii, binding energy and the same electronic configuration of s2 valence [29]. MASnI3 is the most studied lead-free perovskite material. Sn-based perovskites are direct bandgap semiconductors, like Pb-based perovskites. This means, the valence band maximum and conduction band minimum recline at the same position in k-space (reciprocal space). Similar to the APbX3 structure, the structural, optical and electrical properties of ASnX3 perovskite is also affected by the size of A-site cation and X-site anion. MASnI3 perovskite also has a tetragonal structure, but the band gap is near unity that is lower than those of the MAPbI3 [30]. Due to the quantum confinement effect, PQDs shows different behavior from their bulk counterpart.
In case of the pure inorganic perovskite CsPbI3, band gap of PQDs is 1.85–1.97 eV. Such kind of higher bandgap highly encouraged to find some lower Pb-containing, low band gap, and more stable perovskite material. CsSnI3 pure inorganic can be the satisfied the all requirements for the good PQDs because of its lower binding energy and broad absorption from visible to near infrared region. Due to this different behavior, such kind of perovskite can exhibit higher light harvesting efficiency than other perovskite materials [31]. However, the stability of the Sn2+-based perovskite material is the biggest issue due to higher sensitivity to air, moisture and sometimes with nonpolar organic solvents also [32]. In recent years, many significant approaches have been tried for the stability of the Sn2+ perovskites. For example, SnBr2, SnCl2, and SnF2 had used as a dopant into the CsSnI3 perovskite for the stability of the materials. In all, depends, SnF2 and SnCl2 were found more suitable for the air resistive property. However, stability of the Sn-based material was not satisfactory due to the degradation of the sample within only 3hs [33, 34, 35].
In the year 2017, Liu et al. reported, the alloyed CsSn1−xPbxI3 PQDs, which was more phase stable than its parent CsPbI3 and CsSnI3 PQDs for months in ambient air [36]. They have prepared CsSn1−xPbxI3 PQDs via the standard Schlenk line method under a nitrogen atmosphere. In this method, SnI2/PbI2 mixture was rapidly dissolved in trioctylphoshine into the cesium olate at 120–170°C and purified by antisolvent methyl acetate (MeOAc) washing process. The 140°C reaction temperature was found the best for homogeneous and proper morphology of CsSn1−xPbxI3 PQDs. With the incorporation of Sn, red shifting occurred that can be observed in absorption and PL spectra as shown in Figure 1a.
(a) Optical absorption spectra of different Sn doped PQDs and the inset fig shows their corresponding normalized steady photoluminescence spectra, (b) time-resolved photoluminescence decay for various stoichiometries of Sn, (c) X-ray diffraction patterns and (d) XPS spectra for the CsSn0.60Pb0.40I3 PQDs (as prepared) and those after storage for 150 days.
Additionally, the increase in Sn concentration drastically enhanced the light absorption of CsSn1−xPbxI3 PQDs; however, PLQY was found up to 3% only. On the other hand, CsPbI3-based PQDs had up to 100% efficiency to date. Low PLQY with Sn-based PQDs indicates the increase in intrinsic defects that were allied with Sn vacancies. Such kind of vacancies creates deep level defects which act as non-radiative recombination centers and hence this reduces the efficiency of PQDs. Figure 1b also suggested the average lifetime of CsSn1−xPbxI3 PQDs dramatically decreases with increasing the concentration of Sn. This behavior of Sn containing materials also confirms the occurrence of a large density of quenching defects that support the lower PLQY of the PQDs. Liu also reported that CsSn0.60Pb0.40I3 PQDs was best for performance and stability because of the less- Pb content and widest range of light absorption among the alloyed PQDs. Phase, as well as chemical Stability of CsSn0.60Pb0.40I3 PQDs, is confirmed via XRD and XPS analysis (see Figure 1c and d). XRD Figure 3b suggested that there is no degradation was absorbed up to 5 months that is the first time reported such long time stability with Sn-based material.
Furthermore, there was not found Sn4+ oxidation stage in the XPS analysis of the sample. In Figure 1d XPS graph showed 2 spectra at 486.2 and 494.5 eV that is associated with Sn2+ 3d5/2 and 3d3/2 state, while deficiency of spectra at 486.9 indicates the absence of Sn4+ in perovskite compound. Thus this less lead-containing and air-stable Sn-based PQDs can be the best choice for solar cell devices but for highly efficient LED there will be a need in the improvement of its PLQY. Jellicoe and co-workers had also tried for the Sn-based perovskite, CsSnX3 (X = Cl, Br, I) for the lead-free perovskite PQDs but due to the instability of Sn it cannot be used for practical applications [35]. To overcome the stability problem, Wang group had replaced Sn2+ with Sn4+ and developed stable CsSnI6 PQDs with cubic structure. However it’s PLQY was just 0.48% that is also not sufficient for optoelectronic applications [36]. From the several studied we absorbed that, CsSnI3-based perovskites have low PLQY but good hole conducting properties. Hence it is mostly used for solar cell applications. For sufficient PLQY and more stable Sn-based material was still needed for display devices. For this purpose, CsSnBr3-based perovskite was found more suitable candidate than iodine-based perovskites.
Yang group have reported the fast and less Pb or Pb- free perovskite nanocrystals by introducing the Sn in Pb site and I at Br site [37]. They have used one pot hot injection method for preparation of SnI2 doped CsPbBr3 perovskite nanocrystals. After cation and anion exchange between the CsPbBr3 and SnI2, the lead-free CsSnI3 NCs were obtained. These Pb-free NCs maintained the high PLQY as well as morphology in an inert atmosphere. Figure 2a indicated that, with increasing the amount of SnI2 into CsPbBr3 colloidal solution, dramatically red shifting observed in PL emission and absorption spectra. There was one fascinating result was reported regarding the stability of Sn2+. XRD result predicted that Sn2+ converted into Sn4+ and formed the small amount of Cs2SnI6 phase that indicated the cation as well as anion exchange in the sample. After cation exchange between Pb2+ and Sn2+ and anion exchange between Br−1 and I−1, the PLQY of CsSnI3 and CsPbBr3 NCs was found 59.1 and 73.47% respectively. From this result, the author concluded that the ion exchange did not cause the structural and surface defects. Figure 4b shows the schematic representation of the cation and anion exchange in CsPbxSn1−x(BryI1−y)3 NCs. Halide anions have high migration and the sufficient vacancy diffusion ability that is why after incorporation of SnI2 into CsPbI3, halide anions reacts very fast [38]. On the other hand, cation takes more time to reaction with parent material due to the obligation of high activation energy. Moreover, in most of the cases, cation substitution is obsessed with the concentration of halide vacancies [39]. Thus with this cation and anion approach creates a possibility of higher PLQY of Pb-free perovskite NCs.
(a) UV-Visible and PL spectra of different Sn doped CsPbBr3 NCs (A1–6); the colored image of PQDs under 365 nm UV radiation and (b) schematic diagram of the ion exchange process in SnI2 doped CsPbBr3 NCs.
The 100% Pb replacement with any other divalent cation is impossible till date because of the lower conductivity of substitute element like Sn. In the case of the Sn lower ionic conductivity of PQDs causes many surface defects that make material unstable. Some of the Pb-free perovskite with Sn4+ support that instability and toxicity problem can be resolve by partial substitution of Pb2+ with Sn4+. In this regards, Liu et al. have reported the less lead-containing CsPb1−xSnxBr3 PQDs with PLQY up to 83% [40]. They have performed cation exchange via replacing Pb2+ cation with Sn4+ cation using hot injection method. Partial replacement with Sn4+ in CsPb1−xSnxBr3 exhibited the enhancement in PL emission and after some time increasing the more concentration of Sn4+ ion, decreases the PL performance due to the increasing the impurity phase of Cs2SnBr6. In this work, they found CsPb0.67Sn0.33Br3 was the best composition, and PQDs of material, displayed the high external quantum efficiency and current efficiencies. Figure 3a Shows the variation of PL spectra of CsPb1–xSnxBr3 PQDs and digital picture in UV irradiation (365 nm). This PL spectrum show the highest PL intensity for x = 33% while increasing the concentration of Sn; PL intensity starts to decrease due to impurity and more surface defects. Figure 3b shows the absorption and PL emission spectra of samples that indicated the absence of blue shift that means there is no big effect on band gap after Sn4+ incorporation, but exciton recombination can affect the lifetime and lower PLQY with a higher concentration of Sn4+. A higher concentration of Sn4+ also affected the size; morphology and structure of the QDs (see Figure 3c–g). After x = 0.33 Sn4+ amount in CsPbBr3, the impure phase can be seen in the XRD spectrum and irregular shape and agglomerated particles in TEM due to Cs2SnBr6 byproduct.
(a) Variation in PL intensity of different Sn4+ doped CsPbBr3 PQDs. Inset of samples under 365 nm UV light (b) UV-Visible absorbance and PL spectra of CsPb1−xSnxBr3 (c) XRD pattern of CsPb1−xSnxBr3 PQDs, impurity peaks are shown by stare sign. (d–g) TEM images with (d) x = 0, (e) x = 0.33, (f) x = 0.50 and (g) x = 0.67.
Mn2+ is a transition metal cation, and doping of Mn2+ in II-VI semiconductors has been widely investigated due to its excellent optical, electrical and magnetic properties. All ready many studied have been done on Mn2+ doped ZnS, CdSe, CdS, and ZnSe inorganic QDs in which Mn2+ incorporation can enhance the long-lifetime and interaction between host d-electron of Mn dopants [41]. In compare to the traditional II-VI group semiconductors, the soaring tolerance in perovskite can be the better candidate for promoting the exciton energy transfer to Mn d-d emission to Mn d-state.
The band gap of Mn2+ doped in perovskite materials depends upon the presence of halide anions in a host as well as a dopant. For example, change from Cl− to Br− to I−, the PL emission of perovskite is tuned from blue region to red. In the year 2018, Zhao et al. have reported the Mn2+ doped CsPbCl3 NCs and after that intensive exploration are carried on this work [42]. After incorporation of Mn2+cation in place of Pn2+ site, the XRD spectra shied towards higher angle due to the smaller radii of Mn2+ while PL emission shifted towards higher wavelength because of the d-d transition. Hence undoped CsPbCl3 NCs shows blue emission, but after doping of Mn2+, it tuned into orange emission as shown in Figure 4a–c. It was reported that Cl-based Mn dopant and perovskite host is the best rather than other manganese (II) salts [43]. Via hot injection method, it is tough to doping of Mn2+ into CsPbBr3 and CsPbI3 perovskite structure but through the anion exchange process Mn doping is possible. Such kind of possibility depends upon the bond strength and dissociation energy between Mn-X and Pb-X bond. Figure 4d shows the band gap energy diagram for Mn-doped different perovskite host [44]. As we know Cl-based perovskite NCs has very low PLQY (<5%) in compared to Br- and I-based perovskites. Besides reduction in toxicity, Mn2+ doping helps to enhance the PLQY and lifetime of the perovskite NCs. In this regards, Liu and coworkers fabricated CsPbxMn1−xCl3 PQDs via hot injection method [45]. Mn2+ incorporation in CsPbCl3 not only increases the PLQY of host material from 5 to 54% but also created an additional intense PL emission peak at 580 nm that is stand for bright orange color (see Figure 5a). With increasing the Mn2+ concentration secondary, PL peak gradually shifted from 569 to 587 nm. The highest PLQY (54%) was found for the 46% Mn-doped CsPbCl3 perovskite. The various Mn2+ compositions with tunable emission are shown in schematic Figure 5b. CsPbxMn1–xCl3 PQDs has two emission peaks with two different lifetime values such as 13.9 ns at 390 nm and 1.6 ms at 580 nm as shown in Figure 5a and b. The long decay time for second emission peak near 580 nm is assigned to emission from d-d transition energy transfer mechanism for Mn2+ doped semiconductors. Hence Mn2+ doping also increases the overall lifetime of PQDs that may be an improvement in the stability of PQDs also. A similar study was carried by Yuan et al. in which they have obtained PLQY of up to 60% for 14.6% Mn2+ doped CsPbCl3 [46]. With the help of ligand assisted room temperature method (LART), same work was reported by Zhu group with maximum 41.6% PLQY for 28% Mn2+ incorporation in place of Pb2+ [47]. Through LART, Mn2+:CsPbCl3 can be prepared in concise time duration and room temperature that reduce the cost of experiment, easy, simple method and high production of products.
(a–d) Digital images of CsPbCl3, CsPbBr3, CsPbI3 and Mn: CsPbCl3 nanocrystals under 365 nm UV radiation and (e) band positions of CsPbX3 and Mn2+ d-state.
(a) UV-Visible and PL spectra of CsPb0.54Mn0.46Cl3 PQDs (b) schematic illustration of Mn incorporation in CsPbCl3 PQDs by different molar ratio and reaction temperature, (c and d) PL lifetime of CsPbCl3 and CsPb0.73Mn0.27Cl3 PQDs.
In some cases, Mn2+ is beneficial for stability of CsPbX3 PQDs. Zou et al. have found that Mn2+ incorporation in place of Pb2+ not only reduced toxicity while also enhance the thermal as well as air stability of the perovskite samples [48]. Similar to previous work, Zou group also have worked with CsPbCl3: Mn2+ PQDs and studied different structural and optical enhanced properties. Besides this work, they have also provided experimental data for CsPbBr3: Mn and CsPbI3: Mn PQDs to prove the absence of energy transfer in Br and I containing perovskites. Figure 6
Comparison of photoluminescence (PL) emission spectra for (a) CsPbCl3:Mn, (b) CsPbBr3:Mn and (c) CsPbI3:Mn QDs doped with different Mn2+ contents (d) absolute PL quantum yields (QYs) for CsPbCl3:Mn QDs doped with different nominal Mn2+ contents ranging from 0 to 80 mol% (e) absolute PL QYs for CsPbBr3:Mn and CsPbI3:Mn QDs doped with different nominal Mn2+ contents ranging from 0 to 60 Mol% (f and g) PL decay curves (left) and lifetimes (right) for excitonic luminescence of CsPbBr3:Mn QDs upon excitation by a 397-nm pulsed laser (h) PL emission photographs for CsPbBr3:Mn QDs coated on the surface of a glass slide with different Mn2+ contents from 0 to 6.2 mol% taken under UV irradiation at indicated time periods and (i) red PL emission photographs for CsPbI3:Mn QDs with different nominal Mn2+ doping concentrations of 0, 20, 40, 50, 60, 80, 100 mol% from left to right respectively, taken at daylight or under UV irradiation at indicated time period.
Cd and Zn2+ Cation exchange in traditional NCs have been extensively studied, but for perovskite material, there are few reports are present till date. A detailed study of cation exchange has not yet been explained, but halide exchange has been explained well. Halide exchange is easier than cation exchange because of low activation energy and diffusion of anion vacancies in the perovskite materials. Stam et al. have experimentally proved that cation exchange in perovskite takes long time [50]. They reported the cation exchange such as Sn2+, Cd2+, and Zn2+ in place of Pb2+ in CsPbBr3 perovskite host. 10% cation exchange in perovskite system results in the reduction in toxicity due to lead and also maintained the good PLQY as well as high color purity. But with these, cation exchange, the blue shift was observed in PL emission due to smaller ionic radii of Cd and Zn than Pb (as shown in Figure 7k). On the other hand, there is very less shift was obtained in Sn2+ due to similar ionic radii as Pb. The Cd2+ doping in CsPbBr3 PQDs was resulting in PL emission variation between 452 and 512 nm while Zn showed between 462 and 512 nm. Furthermore, over 60% of PLQYs was obtained for cation doped PQDs and good stability in ambient conditions. Cation exchange in PQDs reduced the PL lifetime of the CsPbBr3 PQDs. Figure 7a–j TEM and energy dispersive X-ray spectroscopy mapping of Cd2+ and Zn2+ doped CsPbBr3 PQDs. EDS mapping helped to identify the presence of different doped elements in PQDs. Figure 7a–e shows the Cd and Figure 7f-jshows the Zn doped CsPbBr3 PQDs. These mapping analyses also predicted the uniform distribution and lower concentration of dopant into the host material. Zn2+ incorporation enhanced the stability of CsPbI3 black phase in the air also due to improvement in lattice contraction and alloy form of perovskite.
Energy dispersive X-ray spectroscopy mapping of CsPb1−xCdxBr3 and CsPb1−xZnxBr3 nanocrystals. (a) HAADF-STEM image of CsPb1−xCdxBr3 NCs and corresponding maps of (b) Cs, (c) Pb, (d) Br, and (e) Cd, demonstrating the presence of Cd in the perovskite NCs. The inset in panel shows a photograph of a colloidal suspension of the NCs under UV illumination. (f) HAADF-STEM image of CsPb1−xZnxBr3 NCs and the corresponding maps of (g) Cs, (h) Pb, (i) Br, and (j) Zn, indicating the presence of Zn in the perovskite NCs. The inset in panel f shows a photograph of a colloidal suspension of the NCs under UV illumination (k) parent CsPbBr3 NCs (green lines) and product NCs obtained after reaction with different concentrations of CdBr2 (orange lines) and ZnBr2 (blue lines).
As it is well reported that lower PLQYs of Cl-based perovskite materials due to the large band gap. There are many have published on Mn2+ doped CsPbCl3 PQDs, but with doping of, we get orange color so in this case to obtain pure blue color is impossible. On the other hand, other heterojunction-based PQDs such as CH3NH3Bi2X9, Cs3Bi2Br9 and Cs3Sb2Br9 have been developed for blue emission [50]. But still, these blue color emitted PQDs have 46–52% and very unstable that is not suitable for blue LEDs fabrication. To overcome this issue, Mondal et al. reported the effect of Cd incorporation in CsPbCl3 PQDs by hot injection method to enhance the stability and PLQYs of blue color PQDs [51]. For CdCl2 treatment, CsPbCl3 colloidal solution with CHCl3 was mixed with CdCl2 solution (CdCl2 solution was prepared in ethanol) and sonicated for 2–3 min. The obtained colloidal solution was purified by centrifugation with methyl acetate treatments. The CdCl2 treatment of CsPbCl2 dramatically enhanced the from 3–96% PLQYs and narrow PL emission spectra that also indicates the higher color purity of the treated sample.
There are the best thing is that there was no PL or absorbance spectrum shifting observed with CdCl2 treated samples as shown in Figure 8a. From Figure 8b also indicates the huge improvement in PL emission and bright blue emission under UV light radiation compared to untreated CsPbCl3 PQDs. Generally, with doping of Cd2+ or other lower atomic radii elements than Pb2+, has PL emission shift towards blue region due to lower ionic radii. But in this work, the authors did not get any shifting. CdCl2 incorporation not only enhances the PLQYs while it also improved the lifetime and stability of CsPbCl3 PQDs by the four times of the untreated PQDs (Figure 8c). A similar strategy was applied with CsPbBr3 PQDs and improvement in PLQY and lifetime also absorbed in green PQDs also (Figure 8d–f). Thus this work suggests the Pb2+ cation exchange with Cd2+ not only provide high PLQYs while long term stability without disturbing any peak shifting. So such kind of blue and green PQDs can be beneficial for good quality of blue, green or white LEDs and a backlight system. Thus Cd and Zn doped PQDs may be useful for different optoelectronic applications similar to pure PQDs due to its low toxicity and excellent properties.
UV-Visible absorption and PL spectra (a) of the CsPbCl3 NCs before and after the CdCl2 treatment. PL spectra showing dramatic enhancement of PL upon treatment (b) the inset shows the untreated (i) and treated samples (ii) under a UV lamp. (c) PL decay dynamics (λex = 375 nm, λPL = 406 nm) of CsPbCl3 NCs before and after the treatment with CdCl2. PL spectra (d) and PL dynamics (e) of CsPbBr3 NCs before and after the CdBr2 treatment. (f) Change in PL on addition of CdCl2, starting from treated CsPbBr3 NCs (left) to increased addition of CdCl2 (right).
Lead halide-based perovskite QDs, as a promising light-harvesting material for light absorbing and converting light energy, have attracted research community as well as industrialists due to unique properties of PQDs for solid-state lighting (SSL) and flexible color tuning thin film display application. In recent years, organic LED (OLED) and quantum dot LED (QDLED) join the competition of display market and mean to wrest the dominance from LCD. OLED has the advantage of self-luminous, large area fabrication, fast response time, high contrast and application on flexible substrates [2, 3, 4]. Due to such type of benefits, many manufacturers have invested in the development of OLEDs, and now various products based on OLEDs have been commercially available. However, there are some limitations with OLEDs like wide PL emission wavelength, instability of organic molecules, etc. Due to this issue, it is difficult to achieve high color purity and a high-quality full-color display. So it is still required to develop a new variety of display technology with high color purity and PLQY to meet the higher demand of consumers. To overcome the less color purity problem, quantum dots can be used because of its excellent luminescence and color characteristics as we have already discussed in the previous section. There is a chance to achieve the high-resolution color contrast and a better full-color display device in near future moreover in contrast to another semiconductor (inorganic) employed in solid state lighting device perovskite material have also benefited regarding the synthesis and manifesting process. PQDs can also fabricate at low temp, solution processed approach to precisely control the size, shape, and purity of perovskite material which makes PQDs ideal candidates for the display device. In addition, due to the colloidal solution characteristics, PQDs is cheaper to use, easier to process and easier to fabricate in large area, large scale production thus PQDs are often touted as disruptive material that could completely replace traditional inorganic phosphor LEDs or OLEDs, QLEDs can be mainly divided into types one is photoluminescence QD LEDs (based on photoexcited), and another is electroluminescence (EL) QDLEDs (electron- excited QDs) [3]. PL QDLEDs is the most commonly used a type of LEDs. QDs LEDs usually have applications in the high-quality display, high resolution, and high contrast display device as well as in lighting application. For commercialization, much less lead-containing perovskite QDLEDs have been investigated in recent years. Lead substituted perovskites also used for PL LEDs and electroluminescence LEDs. Zou et al. fabricated the EL-based LEDs using CsPbBr3: Mn perovskite QDs [48]. Active LEDs was fabricated by spin coating of PEDOT: PSS on ITO glass substrate as a hole transporting layer, Mn-doped CsPbCl3 as the active layer and TPBi, LiF/Al were used as electrodes by thermal evaporation technique. The schematic illustration of the device is shown in Figure 9a. This active led produced electroluminescence with green color (512–515 nm) for CsPbBr3 and Mn-doped perovskites with high color purity and narrow emission spectrum FWHM of 20 nm (see Figure 9b). There were no significant shifting observed in EL as well as in current density-voltage properties (Figure 9c) of Mn-doped perovskites. Mn doping enhanced the luminescence of LEDs by 1.3 times of the pure PLEDs and EQE and CE also improved from 0.81% and 3.71 cd/A for the CsPbBr3 PLED to 1.49% and 6.40 cd/A for the 3.8 mol% Mn-doped CsPbBr3 PLED device. Similarly, Liu group also fabricated lead substituted active PLEDs with doping of 33 mol% Sn4+ ion consisting of the same device structure as Zou reported [40]. They reported that the presence of Sn4+ helped in the easy injection of charge carriers that is responsible for small turn off voltage as well as large current density. CsPb0.67Sn0.33Br3 PLEDs showed 4.13% EQE, 12500 cd m−2 luminescence, 11.63 cd A−1 of CE, 6.76 lm W−1 and 3.6 V turn-on voltage. Authors have also claimed that such kind of high performance is the best results found in Sn-based PLEDs. So this lead substituted Sn-based PQDs LED can be suitable for different active LEDs as well for backlight-based display devices. On the other hand, CsPbCl3: Mn PQDs has also been fabricated in PLEDs with 2.2 lm W−1 of luminous intensity (Figure 9d–f) and good stability after continuous applying 3.5 V of voltage for 200 h [45]. 27 mol% Mn: CsPbCl3 was mixed with curable resin and coated on 365 nm commercial UV-LED chip for the PL PLED device. Due to d-d transition, Mn doped CsPbCl3 PLED gives bright orange emission with 54% PLQY in ambient conditions. In most of the optoelectronic devices, photo and thermal stability are the crucial issues. So for improving such kind of stability SiO2 coating and KCl/polystyrene or other inorganic materials has been used for encapsulation of perovskite LEDs [42].
(a) Schematic illustration of a typical multilayer-structured PLED device by using pure CsPbBr3 and CsPbBr3: Mn (2.6 mol%) and CsPbBr3: Mn (3.8 mol%) QDs are used as green light emitters. (b) Comparison of normalized EL spectra at an applied voltage of 6 V and their corresponding PL emission spectra for CsPbBr3 and CsPbBr3: Mn (2.6 mol%) and CsPbBr3: Mn (3.8 mol%) QDs when dispersed in cyclohexane solution. The inset shows a photograph of the EL of a representative PLED device. Current density (c) and luminance characteristics for three types of PLEDs based on the pure CsPbBr3 and CsPbBr3: Mn (2.6 mol%), and CsPbBr3: Mn (3.8 mol%) QDs (d) fluorescent image (e), PL emission spectrum (f) CIE chromaticity coordinate of the LED from CsPbxMn1−xCl3 QDs. Inset: Optical image of the LED.
Lead halide-based perovskite material opens a new opportunity in optoelectric since 2012, because of their excellent optoelectronic properties and high power conversion efficiency within a brief time. The big challenge for the perovskite QDs is the presence of toxicity due to lead. Already many groups have worked on leadless or lead-free perovskite materials. 100% replacement of Pb will be complicated but with replacement up to 60–70%, Pb with non-toxic cation may help to the commercialization of less lead-containing perovskite materials. Shortly, less lead or lead-free PQDs have the potential for next-generation optoelectronic devices like backlights, QD TV, flexible and wearable devices, etc. However, to achieve high PLQY, good performances, and stability of lead-free or less lead containing PQDs also be challenging for the research community. Many homovalent lead substitutions like Sn, Mn, Cd, and Zn have been successfully done in place of Pb in different halide containing perovskite nanomaterials. Such kind of replacement of lead not only reduces the toxicity of perovskite while it also improves the performances and stability of the perovskite light-harvesting material. In the halide-based perovskites, dopant engineering is a compelling strategy to tuning the optical, structural, and electrical properties and day by day new depends arrive that make the PQDs more suitable for lead-free perovskite devices. Mn and Cd incorporation in Cl-based perovskite NCs was increased the PLQYs but for Br- and I-based PNCs it is still challenging to get high PLQYs than pure PQDs. So, we need to find a more suitable strategy for less lead-containing high PLQYs perovskite material.
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