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 σ). The ratio eD/μkT, equal to unity for ordinary diffusion, is found to increase dramatically with increasing disorder and bias field. For σ/kT=3.5 and fields of order 106 V cm-1, eD/μkT 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 587-601 |
| Number of pages | 15 |
| Journal | Philosophical Magazine B: Physics of Condensed Matter; Electronic, Optical and Magnetic Properties |
| Volume | 63 |
| Issue number | 3 |
| State | Published - Mar 1991 |
| Externally published | Yes |
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Anomalous time-independent diffusion of charge carriers in a random potential under a bias field. / Pautmeier, L.; Richert, Ranko; Baessler, H.
In: Philosophical Magazine B: Physics of Condensed Matter; Electronic, Optical and Magnetic Properties, Vol. 63, No. 3, 03.1991, p. 587-601.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Anomalous time-independent diffusion of charge carriers in a random potential under a bias field
AU - Pautmeier, L.
AU - Richert, Ranko
AU - Baessler, H.
PY - 1991/3
Y1 - 1991/3
N2 - 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 σ). The ratio eD/μkT, equal to unity for ordinary diffusion, is found to increase dramatically with increasing disorder and bias field. For σ/kT=3.5 and fields of order 106 V cm-1, eD/μkT 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.
AB - 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 σ). The ratio eD/μkT, equal to unity for ordinary diffusion, is found to increase dramatically with increasing disorder and bias field. For σ/kT=3.5 and fields of order 106 V cm-1, eD/μkT 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0026121973&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0026121973
VL - 63
SP - 587
EP - 601
JO - Philosophical Magazine B: Physics of Condensed Matter; Electronic, Optical and Magnetic Properties
JF - Philosophical Magazine B: Physics of Condensed Matter; Electronic, Optical and Magnetic Properties
SN - 0141-8637
IS - 3
ER -