Syed Abdul Moiz, PhD, is Professor of Electronic Engineering in Umm Al Qura University, Saudi Arabia. His research interests lie in the field of organic/polymer electronic devices, nano-electronics, molecular electronics, photonics devices, charge transport mechanism, etc. He published more than 100 peer-reviewed national and international conference journal papers. He also received science and technology achievement awards.
Polymers have exceptional charge transport mechanism as a combination of delocalization and localization of charge carriers with intramolecular and intermolecular charge interaction, respectively, and most of the time, it is interpreted with Mott-Gurney space charge–limited current model. As polymers are full of traps, therefore, Mott-Gurney space charge–limited model is modified with various trap distributions as trapped space charge–limited model. The most crucial parameter affected by the nature and distribution of traps is the carrier mobility, and it is argued that space charge–limited model is an acceptable choice for the mobility measurement for polymer. Similarly, in order to account the commonly observed lowering of trap barrier height at higher electric field, the Mott-Gurney space charge–limited current is further modified with little variations, which are evaluated and discussed in detail.
Part of the book: Conducting Polymers