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Charge Transport in Vapor‐Deposited p‐Diethylaminobenzaldehyde Diphenylhydrazone
Author(s) -
Borsenberger P. M.,
Borsenberger P. M.,
Lin L.B.,
Lin L.B.,
Magin E. H.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199712)204:2<721::aid-pssb721>3.0.co;2-0
Subject(s) - formalism (music) , classification of discontinuities , activation energy , charge carrier , condensed matter physics , materials science , chemistry , physics , mathematics , mathematical analysis , art , musical , visual arts
Hole mobilities of vapor‐deposited p‐diethylaminobenzaldehyde diphenylhydrazone glasses have been measured over a range of temperatures that includes the glass transition temperature T g . Discontinuities in the temperature dependence were observed at T g . For T > T g , the activation energy is approximately 1/2 its value for T < T g . The results are described within the framework of a formalism based on disorder, due to Bässler and coworkers. The formalism is based on the assumption that charge transport occurs by hopping through a manifold of localized states that are distributed in energy and distance. The key parameters of the formalism are σ, the energy width of the hopping site manifold, Σ the degree of positional disorder, and μ 0 a prefactor mobility. For T < T g , the results yield σ = 0.106 eV, μ 0 = 4.6×10 —3 cm 2 /Vs, and Σ = 1.0. Analyzing the data for T > T g leads to the conclusion that σ increases with increasing temperature while Σ remains constant.