High-field hopping mobility of polarons in disordered molecular solids. A Monte Carlo study

• Published in: Chemical physics letters Vol. 217; no. 1; pp. 41 - 47
• Main Authors: Gartstein, Yu.N., Conwell, E.M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 07.01.1994; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Electronic transport in condensed matter; Exact sciences and technology; Low-field transport and mobility; piezoresistance; Physics; Monte Carlo method; Disordered systems; Hopping; Electron-phonon coupling; Electric field effects; Theoretical study; Carrier mobility; Polarons
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/0009-2614(93)E1346-I

For a system subject to disorder of both diagonal (site energy variation) and off-diagonal (variation of intersite electron wave-function overlap) types we study the high-field mobility of charge carriers including polaronic effects. The elementary jump rate between sites is given by the classical expression due to Marcus and Holstein. We find there is a range of parameters where the dependence on field E of mobility μ is qualitatively similar to that found for the disorder model with Miller—Abrahams-type jump rate, including a region where In μ may be considered proportional to E 1 2 .