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Proceedings Paper

Equilibration and release from deep sites in a Gaussian distribution
Author(s): Zoltan G. Soos; S. J. Schmidt; Debasis Mukhopadhyay
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Paper 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.

Paper Details

Date Published: 15 October 1996
PDF: 12 pages
Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); doi: 10.1117/12.254239
Show Author Affiliations
Zoltan G. Soos, Princeton Univ. (United States)
S. J. Schmidt, Princeton Univ. (United States)
Debasis Mukhopadhyay, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 2850:
Organic Photorefractive Materials and Xerographic Photoreceptors
Stephen Ducharme; James W. Stasiak, Editor(s)

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