Equilibration and release from deep sites in a Gaussian distribution

Zoltan G. Soos; S. J. Schmidt; Debasis Mukhopadhyay

doi:10.1117/12.254239

15 October 1996 Equilibration and release from deep sites in a Gaussian distribution

Zoltan G. Soos, S. J. Schmidt, Debasis Mukhopadhyay

Proceedings Volume 2850, Organic Photorefractive Materials and Xerographic Photoreceptors; (1996) https://doi.org/10.1117/12.254239
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Photocurrents j(t) in molecularly doped polymers (MDPs) have been extensively modeled as hopping transport through a Gaussian distribution of states, g((epsilon) , (sigma) ), whose width (sigma) on the order of 1000 K is taken from experiment. We analyze j(t) and the mobility, (mu) (E,T), in terms of the deepest sites encountered in crossing a film of thickness L. Many steps per net release from deep sites rationalize how M approximately equals 1 - 10 trapping events in MDPs control transits of over 10⁶ steps, as inferred from j(t) fits. Field-dependent energies and multi- step releases from deep sites lead to ln(mu) (E,T) proportional to (root)E at lower E than in direct Monte Carlo simulations. The microscopic picture of backsliding and equilibration with rare deep sites follows directly from the thermodynamics of g((epsilon) , (sigma) ), holds for a activated hopping rates, and has interesting contrasts to dispersive transport.

Citation Download Citation

Zoltan G. Soos, S. J. Schmidt, and Debasis Mukhopadhyay "Equilibration and release from deep sites in a Gaussian distribution", Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); https://doi.org/10.1117/12.254239

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