Activated hopping transport in anisotropic systems at low temperatures

Article

关键词: PSS THIN-FILMS;    DISORDERED-SYSTEMS;    CONDUCTIVITY;    CONDUCTANCE;    TRANSISTORS;    DEPENDENCE;    POLYMERS;    SOLVENT;    MODEL;   

DOI  :  10.1103/PhysRevB.94.195202

来源: SCIE

【 摘 要 】

Numerical calculations of anisotropic hopping transport based on the resistor network model are presented. Conductivity is shown to follow the stretched exponential dependence on temperature with exponents increasing from 1/4 to 1 as the wave functions become anisotropic and their localization length in the direction of charge transport decreases. For sufficiently strong anisotropy, this results in nearest- neighbor hopping at lowtemperatures due to the formation of a single conduction path, which adjusts in the planes where the wave functions overlap strongly. In the perpendicular direction, charge transport follows variable- range hopping, a behavior that agrees with experimental data on organic semiconductors.

【 授权许可】

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