One-dimensional hopping transport in disordered organic solids. II. Monte Carlo simulations

被引:30
作者
Kohary, K [1 ]
Cordes, H
Baranovskii, SD
Thomas, P
Yamasaki, S
Hensel, F
Wendorff, JH
机构
[1] Budapest Univ Technol & Econ, Dept Theoret Phys, Inst Phys, H-1521 Budapest, Hungary
[2] Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany
[3] Univ Marburg, Zentrum Mat Wissensch, D-35032 Marburg, Germany
[4] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[5] Natl Inst Adv Interdisciplinary Res, Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 305, Japan
来源
PHYSICAL REVIEW B | 2001年 / 63卷 / 09期
关键词
D O I
10.1103/PhysRevB.63.094202
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Drift mobility of charge carriers in strongly anisotropic disordered organic media is studied by Monte Carlo computer simulations. Results for the nearest-neighbor hopping are in excellent agreement with those of the analytic theory (Cordes et al., preceding paper). It is widely believed that the low-field drift mobility in disordered organic solids has the form mu infinity exp[-(T-0/T)(2)] with characteristic temperature T-0 depending solely on the scale of the energy distribution of localized states responsible for transport. Taking into account electron transitions to more distant sites than the nearest neighbors, we show that this dependence is not universal and parameter T-0 depends also on the concentration of localized states and on the decay length of the electron wave function in localized states. The results of computer simulation evidence that correlations in the distribution of localized states influence essentially not only the held dependence as known from the literature, but also the temperature dependence of the drift mobility. In particular, strong space-energy correlations diminish the role of long-range hopping transitions in the charge carrier transport.
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页数:5
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