Comparison of the time of flight current shapes predicted by hopping and multiple trapping models
Chemical Physics(2014)
摘要
We have compared time-of-flight curves predicted by hopping and multiple trapping models with the Gaussian and exponential site/trap energy distributions, fitting Monte-Carlo predictions of the former with numerical calculations of the latter in a wide time domain using logarithmic coordinates lg j-lg t for the characterization of current shapes and an estimation of transit times. As a prototype hopping theory, we used the Gaussian disorder model while for representing the quasi-band theories we relied on the multiple trapping model, both of these for two types of the site/trap energy distributions. In case of the Gaussian distribution of trap depths, fitting procedure requires adjusting of the two model parameters (an energy distribution parameter sigma and a frequency factor nu(0)). For an exponential distribution, a one-parameter (nu(0)) fitting suffices. The dipolar glass model, unlike the Gaussian disorder model, is basically different from the multiple trapping formalism, but a recently introduced two-layer multiple trapping model seems capable of reproducing TOF current shapes rather well. (C) 2014 Elsevier B. V. All rights reserved.
更多查看译文
关键词
Charge transport,Molecularly doped polymers,Hopping and multiple trapping theories,Time of flight
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络