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Proceedings Paper

Computer simulation of photocurrent transients for charge transport in disordered organic materials containing traps
Author(s): Sergey Vitalyevich Novikov; David H. Dunlap; Vasudev M. Kenkre; Anatoly V. Vannikov
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Paper 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.

Paper Details

Date Published: 5 October 1999
PDF: 8 pages
Proc. SPIE 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers, (5 October 1999); doi: 10.1117/12.363887
Show Author Affiliations
Sergey Vitalyevich Novikov, A.N. Frumkin Institute of Electrochemistry and Univ. of New Mexico (Russia)
David H. Dunlap, Univ. of New Mexico (United States)
Vasudev M. Kenkre, Univ. of New Mexico (United States)
Anatoly V. Vannikov, A.N. Frumkin Institute of Electrochemistry (Russia)

Published in SPIE Proceedings Vol. 3799:
Organic Photorefractives, Photoreceptors, Waveguides, and Fibers
David H. Dunlap; Stephen Ducharme; Robert A. Norwood; David H. Dunlap; Robert A. Norwood, Editor(s)

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