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Temperature dependent dc dark conductivity in poly(n‐vinyl carbazole): Arrhenius and density of state model
Author(s) -
SantosLémus S.,
Luna M.
Publication year - 1993
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760330809
Subject(s) - arrhenius equation , materials science , carbazole , activation energy , conductivity , electrical resistivity and conductivity , thermodynamics , polymer chemistry , chemistry , physics , photochemistry , quantum mechanics
DC dark conductivity (σ) has been measured in thin films of poly(N‐vinyl carbazole) (PVK). The dependence of σ on temperature ( T ) followed a typical Arrhenius relation but at the same time a relation σ( T )α exp(‐[ T 0 / T ] 2 ) could be fitted to the experimental points. To reconcile this observation, it is suggested that the expression for the conductivity then is expected to contain in addition to the activation term, the factor exp[‐( T 0 / T ) 2 ] which is the behavior expected in a trap‐free molecular hopping system with a Gaussian distribution of sites energy, so that the DC dark conductivity would be of the functional form\documentclass{article}\pagestyle{empty}\begin{document}$$ \sigma (T)\alpha {\rm exp} - [\Delta \varepsilon /\kappa T + (T_0 /T)^2] $$\end{document} .