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Anomalous time-independent diffusion of charge carriers in a random potential under a bias field
- Source :
- Philosophical Magazine B; March 1991, Vol. 63 Issue: 3 p587-601, 15p
- Publication Year :
- 1991
-
Abstract
- We present Monte Carlo simulation results for time-independent drift and spatial spreading of a packet of charge carriers executing a random walk within a manifold of hopping sites under a bias field. The shape of the density-of-states profile is assumed to be Gaussian (width s`). The ratio eD/μkT, eaual to unity for ordinary diffusion, is found to increase dramatically with increasing disorder and bias field. For s`/kT=3.5 and fields of order 106Vcm-1, eD/μk T reaches values of order 103. The effect accounts for the anomalous spreading of time-of-flight profiles often seen in photocarrier transit time studies on various polymeric systems. The role of disorder in charge-carrier transport is emphasized.
Details
- Language :
- English
- ISSN :
- 13642812 and 14636417
- Volume :
- 63
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Philosophical Magazine B
- Publication Type :
- Periodical
- Accession number :
- ejs11728131
- Full Text :
- https://doi.org/10.1080/13642819108225974