Computer simulation of photocurrent transients for charge transport in disordered organic materials containing traps

Sergey Vitalyevich Novikov; David H. Dunlap; Vasudev M. Kenkre; Anatoly V. Vannikov

doi:10.1117/12.363887

5 October 1999 Computer simulation of photocurrent transients for charge transport in disordered organic materials containing traps

Sergey Vitalyevich Novikov, David H. Dunlap, Vasudev M. Kenkre, Anatoly V. Vannikov

Author Affiliations +

Proceedings Volume 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers; (1999) https://doi.org/10.1117/12.363887
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We present results of computer simulations of the charge carrier mobility dependence on the electric field and trap concentration in disordered polar organic materials. Recently an unusual dependence of the charge carrier drift mobility in molecularly doped polymers on the concentration of traps has been reported. This dependence differs from the expected inverse proportionality that should be valid for trap-controlled transport. Using our results we argue that this dependence is caused by the existence of different regimes of charge carrier transport for layers with different trap concentrations, i.e. dispersive transport for small trap concentrations and nondispersive transport for high trap concentrations. Our results also show that the mobility, estimated from the time of intersection of the asymptotes to plateaus and trailing edge of photocurrent transient, is very sensitive to variation of transient shape and, in some case, effectively masquerades real concentration and field dependence of the true mobility. Change of the shape with the change of electric field in trap-containing matrices distorts significantly the field dependence of the mobility, calculated by the intersection procedure, and even transforms the usual Poole-Frenkel dependence to the linear one.

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Sergey Vitalyevich Novikov, David H. Dunlap, Vasudev M. Kenkre, and Anatoly V. Vannikov "Computer simulation of photocurrent transients for charge transport in disordered organic materials containing traps", Proc. SPIE 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers, (5 October 1999); https://doi.org/10.1117/12.363887

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