The d.c. conductivity of chalcogenide films due to the correlated barrier hopping mechanism

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Abstract
Within the pair approximation, the correlated barrier hopping (CBH) mechanism apparently correlates the observed trends in the a.c. conductivities of chalcogenide films, Invoking an extended pair approximation, it is found that this mechanism is consistent in the case of wide band-gap materials in that it gives rise to an insignificant contribution to the observed d.c. conductivity which may then be correctly accounted for by invoking other processes. In the case of small band gap materials, however, this mechanism yields d.c. conductivities orders of magnitude larger than are observed.

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