Crystallographic data for MAPb(Br1−xClx)3 with x = 0, 0.33, 0.5, 0.67, and 1 at room temperature from NPD.
\r\n\t
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The introduction of CH3NH3PbX3 (X = Br and I) as the absorber material in an electrolyte-based solar cell structure established the beginning of perovskite-based photovoltaics [2]. However, the power conversion efficiency (PCE) and cell stability were low due to the corrosion of the perovskites by the liquid electrolyte. The replacement of the liquid electrolyte with a solid hole-transporting material led to a key progress in 2012, resulting in both higher PCE and cell stability [3]. Subsequently, great efforts have been devoted to the improvement of these hybrid perovskite-based cells, including the development of a wide range of architectures, which allowed the PCEs to increase up to 23% within the past years [6]. These halide perovskites have been shown to be finer and to exhibit more suitable optical and electrical properties, like the adaptability of the band gap by introducing different halides (i.e., bromide, chloride, iodide) and its relative proportion in the perovskite [7, 8, 9], the high absorption coefficient [10], and the long lifetime of the photogenerated species [11].
CH3NH3PbI3-based perovskite solar cells have been more extensively investigated, due to their fast charge extraction rates and their near-complete visible light absorption, related to a relatively low band gap, around 1.6 eV [11, 12]. However, the poor stability of CH3NH3PbI3 and rapid degradation in humidity has remained a drawback for its practical application, as a commercialized product [13, 14, 15, 16]. CH3NH3PbBr3 constitutes a promising alternative, which presents a good charge transport in devices due to its long exciton diffusion length [17]. In addition, its cubic phase and low ionic mobility lead to a better stability under air and moist conditions, compared to the pseudo-cubic CH3NH3PbI3 phase, [7, 17, 18, 19]. Nevertheless, there are some undesirable features to be concerned about in these bromide-based perovskites; it is the case of a larger band gap (2.2 eV), which decreases the solar light absorption [20, 21], the relatively large exciton binding energy and the reduced light absorption beyond its band edge at 550 nm (linked to its, previously indicated, larger band gap), associated with more limited efficiencies of CH3NH3PbBr3 solar cells [7, 18, 19, 22, 23, 24].
In parallel with the evaluation of the influence of a particular chemical composition of the perovskite, it is mandatory to determine the crystallographic structure under conditions in which the sample will be used. As other perovskite structures, CH3NH3PbBr3 consists of a framework constituted by corner-sharing PbBr6 octahedra, determining large cages where CH3NH3+ units are located. In order to correlate the crystal structure of the perovskites with their electro-optical properties, it is necessary to exhaustively study the structural details, including the orientation of the methylammonium (MA) units within the perovskite cage in the course of phase transitions. Although synchrotron XRD data are essential, this can only be fully accomplished using neutrons as a probe due to the presence of protons. Usually, the MA configuration is linked to the rotation or tilting of the PbX6 octahedra; the more symmetric the octahedral framework is, the more delocalized appears the organic unit inside the inorganic cage. This information is essential to establish relationships between these structures and the macroscopic phenomenology (optical and physical properties when these compounds are used as optoelectronic materials).
MAPbBr3 was previously studied by diffraction techniques in single crystal form by X-ray or in deuterated samples by neutron beams [25, 26, 27]. On the other hand, CH3NH3PbCl3 is also an alternative material that presents a wider band gap (3.1 eV), being also sensitive to the UV region. Furthermore, this compound exhibits a fast photoresponse and long-term photostability, having a charge carrier concentration, mobility, and diffusion length comparable with the best-developed crystal structures of CH3NH3PbI3 and CH3NH3PbBr3 [28, 29, 30]. However, both CH3NH3PbCl3 and the mixed anion CH3NH3Pb(Br1−xClx)3 have been less investigated [31].
In this chapter, we review our previous work on the CH3NH3Pb(Br1−xClx)3 system, where we have investigated the crystallographic features in powdered, non-deuterated samples, using the mentioned state of the art techniques, neutron and synchrotron X-ray diffraction [32, 33, 34]. The crystal structure of MAPbBr3 has been determined and refined at different temperatures, describing the evolution of the orientation of MA group in the 120–295 K temperature range. We found a partial delocalization in the cubic phase (at room temperature), where C and N atoms present large multiplicity positions, becoming progressively localized across the sequence cubic-tetragonal and finally orthorhombic, at 120 K, with MA units fully oriented in the (101) plane [32]. Regarding to Cl-containing phases, a systematic study of the structural properties of hybrid mixed perovskites CH3NH3Pb(Br1−xClx)3 by combining synchrotron X-ray diffraction and UV-vis spectroscopic analyses reveals that the band gap can be chemically tuned according to the Br/Cl ratio. The orientation of the organic MA units may also play an important role in the optoelectronic properties of these materials. By neutron powder diffraction, we found at RT three different orientations depending on the chlorine content and, therefore, on the unit-cell size. At lower temperatures, we unveiled that the halide disorder prevents the cooperative rearrangements needed to drive the octahedral PbX6 tiltings in intermediate Br/Cl ratios; only CH3NH3PbCl3 underwent conspicuous phase transitions (cubic at room temperature, evolving to tetragonal and orthorhombic at 120 K) [33]. H-bond interactions with the halide ions stabilize these conformations, in accordance to reported theoretical calculations [34].
The crystal growth of CH3NH3Pb(Br1−xClx)3 (x = 0, 0.33, 0.5, 0.67 and 1) [32, 33, 34] was made from stoichiometric amounts of CH3NH3X and PbX2 (X = Cl, Br). Previously, the methyl ammonium bromide and methyl ammonium chloride were synthesized from methyl amine (CH3NH2) and the corresponding acid HBr and HCl, respectively, according to the following reaction:
Then, the obtained methyl ammonium halides were reacted with the lead halide in stoichiometric amounts in dimethyl formamide (DMF) according to the following reaction:
From this procedure, the mixed halide perovskites were obtained as well crystallized materials, showing crystals of variable sizes and colors, varying from orange for CH3NH3PbBr3 to white for CH3NH3PbCl3, adopting progressively paler hues of yellow as Cl content increases, as shown in the optical microscope images included in Figure 1. The effect of halide composition on the morphology and structure of crystals was observed in SEM images as is also shown in Figure 1. In all cases, the obtained perovskites show cuboid-type microcrystals. The content of chloride induces a decrease in the size of the crystals of the mixed perovskites.
SEM images of the mixed perovskites and optical microscope images of as-grown CH3NH3PbX3 (from X = Br to Cl) perovskites. The insets show the color variation as Cl is introduced.
Synchrotron X-ray diffraction (SXRD) technique provides an extreme angular resolution of the patterns, useful to define the symmetry of the different phases and to determine its evolution below room temperature (RT). The crystal structures at RT are cubic, and they are well defined in the space group
(a) SXRD profiles for CH3NH3PbBr3 at RT, after a pattern matching showing the characteristic perovskite peaks and the absence of impurities. Red circles are the experimental points, the black full line is the calculated profile. The green vertical marks represent the allowed Bragg positions in the
These anomalies were assigned to the structural disorder introduced by the mixture of halides, for x = 0.33, 0.5, and 0.67. The ADPs should account for the structural disorder, which can also generate a perturbation in the interactions between the inorganic PbX6 skeleton and the methyl-ammonium units. This perturbation is absent in MAPbBr3 and MAPbCl3, containing single halide ions. In Figure 3, a statistical probability distribution of the halide environment of MA groups is plotted, showing this behavior for the different samples (CH3NH3Pb(Cl1−xBrx)3, x = 0, 0.33, 0.5, 0.67, and 1). It is remarkable that for MAPbBr3 and MAPbCl3 the probability is 100%, because all of their MA units are coordinated to 12 Br or Cl atoms; this state contrasts with the mixed halide situations (x = 0.33, 0.5, and 0.67). These distributions reveal the high structural disorder given in mixed situations, in contrast to both end members. These probably induce tensions in the lattice preventing a linear behavior between the pure bromine and chlorine compounds. The inserts in Figure 3 include illustrative schemes of the extreme situations in comparison with an intermediate case where the MA is coordinated to eight chlorides and four bromides, y = 8.
Statistical probability distribution of the halide environment in CH3NH3Pb(Cl1−xBrx)3 (x = 0, 0.33, 0.5, 0.67, and 1).
The thermal variation of the crystallographic structures was followed between 120 K and RT. Figure 4 shows the temperature evolution of selected diffraction lines for all members of the series. In this temperature range, only both end members of the series (x = 0 and 1) exhibit phase transitions; in contrast, for the mixed halide compositions, no phase transitions have been detected, observing cubic structures (
Thermal evolution of selected diffraction lines in which the phase transitions are evidenced, from SXRD data, collected at MSPD diffractometer at ALBA synchrotron (Spain) [
Previous works also report on the polymorphic evolution of Br and Cl phases. Swainson et al. report on two phase transitions for MAPbBr3:
Our work on CH3NH3PbBr3 shows that the SXRD patterns collected at RT, 270 and 240 K correspond to cubic symmetry, defined in the
For MAPbCl3, the mechanism or transient state from cubic to orthorhombic symmetry has been until now only partially known. As indicated previously, the tetragonal phase (
(a) Selected angular region of the SXRD patterns of MAPbCl3 at increasing temperatures (from 150 to 180 K), illustrating the evolution and splitting of some characteristic reflections. (b) Thermal evolution of the unit-cell parameters of the MAPbCl3 perovskite in the same temperature range [
From these facts, it is clear that MAPbCl3 goes through a more complex transition compared to the ones already reported. To summarize, there are three phases: cubic, orthorhombic (
As reported in [32, 33], MAPbCl3 and MAPbBr3 are stable above 179 and 237 K respectively; therefore, it is relevant to mention the lack of any other phase transition down to 120 K in mixed halide perovskites. The anion disorder in the mixed-halide phases could explain this surprising behavior. As it was previously mentioned, the interactions between the organic and inorganic parts differ from one sample to another within the present series (see Figure 3). The phase transitions are prevented due to the halide disorder, because it does not allow the rearrangements that are required in terms of octahedral tilting. Finally, SXRD measurements and their analysis (Rietveld refinements) provide new evidence that allows to complete the polymorphic evolution in the MAPb(Br1−xClx)3 family, as displayed in Figure 6.
Thermal evolution of the unit-cell parameters of MAPb(Br1−xClx)3 perovskites in the 120–300 K temperature range [
The neutron powder diffraction (NPD) investigation is essential to obtain a detailed description of these hybrid materials. The NPD data were collected at the D2B diffractometer (ILL, France) [32, 34]. In particular, the distribution of MA groups can be elucidated taking advantage of the high contrast in the coherent scattering lengths of Pb, Br, Cl, C, N, and H, of 9.405, 6.795, 9.577, 6.646, 9.36, and −3.739 fm, respectively.
However, there is an issue in the resolution of the structure that needs to be considered. The incoherent background in a powder experiment is considerably large due to the presence of hydrogen, which has an important inelastic component (25,274 barns) that gives rise to a significant incoherent background. This is not an obstacle for the crystallographic Rietveld refinement if sufficient statistic is achieved during the measurement.
On the other hand, due to the negative contribution of hydrogen to the scattering, some strategies are necessary to find the adequate distribution of MA in the inorganic PbX6 framework. First, the instrumental and the unit-cell parameters were refined using the Le Bail method. The structure of the octahedral PbX6 framework was eventually considered in the model, placing the lead atoms at 1
This analysis in MAPbBr3 [32] yields the positive (represented in yellow) and negative (represented in blue) isosurfaces shown in Figure 7a, which correspond to the C/N and H positions, respectively. The negative scattering regions are due to the negative scattering of protons while the positive zone corresponds to C/N atoms. These nuclear densities support that the MA units are delocalized in the A site of the perovskite. Considering the positive density, the C/N atoms are located at 24
DFM isosurfaces of MAPb(Br1−xClx)3 series for x = 0 (a), 0.33 (b), 0.5 (c), 0.67 (d), and 1 (e), from NPD data [
In contrast, the DFM for MAPbBr2Cl show that the positive and negative densities match exactly with those expected for the MA cations oriented along [111] directions. It is possible to deduce that the C/N and H atoms are placed at 8
From the Fourier synthesis maps, a crystallographic model can be built with the MA configurations, to start the structural Rietveld refinements from the NPD data. Additionally, the MA displacement toward –NH3 group also can be considered, as it was proposed from theoretical calculations [37, 38]. This last approach corresponds to the plausible chemical interactions between the organic cation and inorganic framework; the greater electronegativity of nitrogen produces H-bond interactions shorter than C–H⋯X. Considering this last fact and the DFM results, the Rietveld refinement of NPD data was made. Minor amounts of MACl were identified and included in the refinements as second phase in the chlorine phase. The Rietveld fits for MAPbBr3 and MAPbCl3 are illustrated in Figure 8. The crystal structure data after these refinements are listed in Table 1 for all the compositions. This table shows the three different combinations of C/N and H positions considering three possibilities for the MA delocalization in the PbX6 framework observed in the MAPb(Br1−xClx)3 series. The variation of the unit-cell parameter with the Cl-doping is illustrated in Figure 9; here, a change of slope is observed in the perovskite with an equimolar amount of Br and Cl atoms, according to the anomaly obtained from synchrotron data.
Rietveld plots of a) MAPbBr3 and b) PbPbCl3 from NPD data, at RT.
MAPb(Br1−xClx)3 | x = 0 [32] | x = 0.33 [34] | x = 0.5 [34] | x = 0.67 [34] | x = 1 [34] |
---|---|---|---|---|---|
5.9259(4) | 5.8454(8) | 5.80459(6) | 5.76955(7) | 5.6813(5) | |
Pb (1 (0,0,0) | |||||
U11 = U22 = U33 | 0.025(2) | 0.048(3) | 0.0313(3) | 0.031(2) | 0.0239(4) |
Br1−xClx (3 (0.5,0,0) | |||||
0 | 0.38(3) | 0.55(5) | 0.67(8) | 1 | |
U11 | 0.018(5) | 0.028(5) | 0.0147(5) | 0.026(4) | 0.0471(8) |
U22 = U33 | 0.138(5) | 0.130(5) | 0.1318(6) | 0.104(4) | 0.1151(7) |
N/C | C/N ( 0.407(2) | N1( 0.5809(5) | N1(0.5, 0.6290(4) | N1(0.5, 0.6294(5) | N1(0.5, 0.6594(5) |
C2( 0.4378(5) | C2(0.5, 0.3777(6) | C2(0.5, 0.3782(6) | C2(0.5, 0.4113(5) | ||
Uiso*/Ueq | 0.039(7) | 0.061(1)* | 0.051* | 0.051* | 0.039(1)* |
H | H1(0.5, 0.414(9) 0.247(9) | H11( 0.5839(6) 0.7363(9) | H11(0.5, 0.664(1) 0.702(3) | H11(0.5, 0.665(1) 0.702(3) | H11(0.5, 0.670(1) 0.720(2) |
H2( 0.326(3) 0.448(4) | H12( 0.4416(7) 0.2841(8) | H12( 0.640(1) 0.419(1) 0.702(3) | H12( 0.641(1) 0.418(1) 0.702(3) | H12( 0.6445(9) 0.4166(9) 0.720(2) | |
H21(0.5, 0.331(1) 0.305(3) | H21(0.5, 0.331(1) 0.306(1) | H21(0.5, 0.326(1) 0.351(2) | |||
H22( 0.357(1) 0.583(1) 0.305(3) | H22( 0.356(1) 0.583(1) 0.306(3) | H22( 0.354(1) 0.585(1) 0.351(2) | |||
Uiso*/Ueq | 0.06(1) | 0.063* | 0.063* | 0.063* | 0.059(2)* |
Rp(%) | 1.3 | 1.3 | 1.0 | 1.2 | 0.8 |
Rwp(%) | 1.6 | 1.7 | 1.3 | 1.5 | 0.9 |
χ2 | 1.1 | 1.1 | 1.3 | 1.1 | 1.2 |
RBragg(%) | 3.9 | 10.8 | 6.5 | 6.5 | 6.4 |
Crystallographic data for MAPb(Br1−xClx)3 with x = 0, 0.33, 0.5, 0.67, and 1 at room temperature from NPD.
Unit-cell parameters variation for MAPb(Br1−xClx)3 from NPD data, at RT.
For x = 0.5, 0.67, and 1, the unit cell experiences a contraction, keeping a constant slope as Cl is introduced, with the MA oriented in the same direction. On the other hand, for x = 0 and 0.33, the unit cell parameters do not follow this trend, the MA orientation is different.
A feature to highlight is the difference in negative density (arising from H positions) observed between [111] and [100] orientations. While along the [111] direction, the three terminal H atoms of the H3C-NH3+ units are fixed, as it is shown in Figure 7b. From the negative density displayed in Figure 7c–e, it is noticeable that four H atoms are comprised in the (100) plane, suggesting that the MA units occupy equivalent positions, so that each H points to each of the four halides in the edges of the perovskite unit cell, thus manifesting the importance of H⋯X hydrogen bonds. This bonded H is located in H11 site and the other two H of the amine group are located in the H12 site. Similarly, the methyl group is formed by C2, H21, and H22 atoms.
Looking back at the unit-cell variation, the contraction of the PbX6 octahedron as Cl is introduced leads to a localization of the MA units, limiting their orientation. This decrease has been deeply studied below room temperature, as the crystal goes through the phase transitions: cubic-tetragonal-orthorhombic [37, 39, 40]; however, in this case, CH3NH3Pb(Br1−xClx)3, the behavior is observed in the same crystal system at RT [34]. This finding shows that the MA freedom degree reduction can occur either by a decrease in the symmetry or by size reduction (keeping the symmetry) in the PbX6 network. These discoveries renew the question whether the inorganic framework deformation occurs and then the MA units accommodate in the preferred directions, or the reduction in the MA freedom degree enables the inorganic framework to adopt a low symmetry. This dichotomy is as the
On the other hand, the role of H⋯X interactions in the MA conformations is not unknown [41, 42] but shows some controversy among the different results. Theoretical studies from DFT indicate that the energy difference between the low index [100], [110], and [111] orientations of the MA units is similar, but with a subtle preference for the [100] orientation in the tetragonal MAPbI3 [40]. However, the ab initio simulations performed by Shimamura et al. [43] unveiled that [110] was the preferred orientation due to the H⋯X interactions in MAPbI3. Differently, Li et al. identify [111] and [100] for the MAPbI3 and MAPbCl3 perovskites as the favorable orientations [38]. Afterward, Varadwaj et al. reinforced this last idea by also stating that these orientations were the most energetically favorable [37]. Although there is significant theoretical work regarding the MA units orientation in cubic symmetry, experimental evidence is lacking [25, 27, 36]. It is the case of the Baikie et al. [27] report that focuses on the three structures for X = I, Br, and Cl from X-ray and neutron diffraction data. In all the cases, the MA components were refined in the [110] direction. In this context of theoretical results, the considerations made in the CH3NH3Pb(Br1−xClx)3 refinements offer new possibilities to achieve a detailed analysis of the crystal studies in comparison with these theoretical works. Once the atomic positions are refined, a “deconvolution” of the MA units orientation can be done for the directions [111] and [100]. The H⋯X interactions obtained can be compared with those predicted theoretically.
The MA units within the cubic unit cell are presented in Figure 10, the three alignment possibilities ([110], [111], and [100]) are shown. The MA in MAPbBr3 is aligned along [110] and, as can be seen in Figure 10a and d, in this orientation the N–H bonds point toward face centers or cube corners forming smalls angles N–H⋯Br; hence, this configuration is not suitable for hydrogen bonding. On the other hand, for x = 0.33 (along [111] direction), the H–C and H–N interact with a unique halide (X = Cl0.33Br0.67) with a distance of 2.921(5) and 3.088(5) Å, respectively (Figure 10b and e). As mentioned, the MA conformation is slightly displaced, the (C)H⋯X distances are larger than (N)H⋯X, which could be explained by the bigger electronegativity of N compared to C.
Methyl-ammonium conformations in the MAPbBr3 (a) and (d), MAPbBr2Cl (b) and (e) and MAPbCl3 (c) and (f) perovskites, from NPD data at RT. The lowest figures (d), (e) and (f) are shown along the MA direction.
Varadwaj et al. reported on DFT calculations for the MAPbBr3 perovskite [37]; the distances were determined, being ≈2.44 and ≈3.47 Å for (N)H⋯X and (C)H⋯X, respectively, in agreement with the NPD experimental results. Carrying out the same procedure for x = 0.5, 0.67 and 1, we can determine the orientation of the MA units, which resulted to be [100]. The MA units can be rotated in four positions along the three [100] directions giving 12 possible conformations. With the help of DFT calculations, the orientation of the MA unit for bromine and chlorine phases can be estimated, with the additional fact that the (N)H⋯X distances are shorter that the (C)H⋯X ones [37, 38]. Figure 10c and f illustrate a MA unit from the obtained C, N, and H atomic positions for MAPbCl3; two different types of H-bonds can be distinguished: normal (N1–H11⋯X) and bifurcated (N1–H12⋯X). Similarly, the methyl group shows the same interactions through H21 and H22 atoms. The obtained distances for x= 1 phase are 2.459(8) and 2.615(8) Å for N1–H11∙∙∙X and N1–H12∙∙∙X, respectively [38].
The structural refinement from NPD data provide, for the first time, experimental evidence of the MA alignments, confirming the theoretical results reported up to now.
The optoelectronic properties are characterized using different techniques such as diffuse reflectance UV-vis spectra and building a photodetector device where the current-voltage (IV) curves are measured under illuminations. This device was fabricated by drop-casting the perovskite solution onto Au/Cr pre-patterned electrodes.
The UV-vis spectra, illustrated in Figure 11, are used to calculate the optical absorption coefficient (α) according to the Kubelka-Munk equation:
UV-vis absorption spectra for MAPb(Br1 − xClx)3. The colored line corresponds to the band gap energy.
where R is the reflectance (%). The optical band gap is determined from the extrapolation of the linear part of the transformed Kubelka-Munk spectrum with the hν axis. Absorbance vs. wavelength of the incident radiation for MAPb(Br1−xClx)3 series is illustrated in Figure 11. In this plot, the included color chart allows accounting for the sample color shown in Figure 1.
The absorption edge presents a gradual evolution, which is consistent with the continuous structural changes, mainly with the unit-cell parameter evolution. The energy of the gap experiences an increment as Br is progressively replaced with Cl. This is, in principle, expected as a consequence of the smaller covalency of the lead-halide bonds within the PbX6 (X = Cl, Br) octahedra [31]. Recent studies by density functional theory (DFT) show that the edges of the valence band and conduction band of CH3NH3X3 perovskites are principally made up of
Comparison between the band gap energy and unit-cell parameter in MAPb(Br1−xClx)3, as a function of the Cl content, x. The color in the circles corresponds to the band gap energy.
As already mentioned, an interesting feature is that the compositional evolution of the band gap energy (Eg) does not possesses a linear behavior; it seems that the deviation from linearity is reminiscent of that unveiled for the variation of the unit-cell parameters at RT (see Figure 12). By additionally contrasting the Eg value with the Pb–X bond lengths, a non-linear behavior is apparent, suggesting that the evolution of Eg is not only related to the inorganic features. From this point of view, it is interesting to consider that, although all these studies are based on the nominally simple cubic perovskite structure, these compounds are in fact very complex. For example, in (CH3NH3)PbI3, the dynamics associated with the (CH3NH3)+ ions are still not fully understood, although ab initio calculations show [46] that at room and higher temperature, the rotation of CH3NH3 molecules can be viewed as effectively giving local structures that are cubic- and tetragonal-like from the point of view of the PbI3 framework, though in fact having lower symmetry. These arrangements are locally polar, with sizable polarization, ~10 μC/cm2 due to the dipoles on the organic part [46]. The structural transitions are thus analogous to the transitions between two ferroelectric structures, where there is strong screening of charged defects that can lead to enhanced mobility and charge collection.
This observation seems to confirm that the increase in the Eg with the amount of Cl− is closely correlated with the effect of the MA and its freedom degree in the inorganic framework. The change in the MA delocalization upon the incorporation of smaller Cl− anions is an additional parameter to be considered in the tuning of the optical properties of these hybrid materials.
Furthermore, the potential of these materials in optoelectronic applications can be exemplified for MAPbBr3 measuring the current-voltage (I-V) in a photodetector device that is illustrated in Figure 13a [32]. The effect of the optical power densities under illumination at 505 nm in the I-V curves is plotted in Figure 13b. This device shows a photoresponse among the best ones reported for other perovskite-based photodetectors, even considering different geometries: 2D-MAPbI3 [47, 48], thin films [49, 50], nanowires [51, 52], and networks [53]. Starting from I-V measurements using different wavelengths from alternative light sources, always keeping the same illumination power of 1 mW/cm2, it is possible to calculate the wavelength responsivity spectrum of the photodetector, by using the next formula:
(a) View of the photodetector device, including a crystal of MAPbBr3 grown between two pre-patterned electrodes, separated apart by 10 μm. (b) Current-voltage (I-V) curves obtained with 505-nm illumination, by changing the incident optical power densities. (c) Spectrum displaying the responsivity for different wavelengths. (d) Generated photocurrent vs. time, when a modulated illumination is applied with a fixed voltage [
with R being the responsivity, Iph the generated photocurrent, and P the illumination power on the device. These data are illustrated in Figure 13c, they show a maximum in the responsivity (0.26 A/W) for light with wavelength of 505 nm, which is near the wavelength with maximum solar irradiance. Figure 13d plots the current through the device as a function of time with a fixed voltage under pulsed illumination. This illumination mode allows to characterize the response time of the photodetector, in this device <100 ms (limited by the experimental setup), which is comparable with values previously reported [47, 48, 54, 55].
This chapter reviews recent structural results on the CH3NH3(Br1−xClx)3 series. The combination of SXRD and NPD has permitted to address issues related to phase transitions below RT, and the conformation of the CH3NH3+ units within the inorganic cages, formed by corner-sharing PBX6 octahedra. Interestingly, it was observed that the progressive localization of the organic units is not only achieved through a reduction in symmetry (from cubic to tetragonal, and finally to orthorhombic), but also simply as a consequence of the contraction of the cubic unit cells as the Cl contents increase. This can be interpreted as an evolution of the X—H hydrogen bonds, as previously observed from DFT calculations. In summary, we have contributed with novel experimental evidence that facilitates a more reasonable design of hybrid halide perovskites with tunable properties for solar cell technologies.
This work was supported by the Spanish MINECO for funding MAT2017-84496-R. The authors thank ALBA and ILL for making the facilities available. CAL acknowledges ANPCyT and UNSL for financial support (projects PICT2017-1842 and PROICO 2-2016), Argentine.
We acknowledge support for the publication fee by the CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI).
The authors declare no conflict of interest.
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