Abstract
Using the concept of thermally activated mobility, a theory is developed to calculate the thermally stimulated current (TSC) in hopping systems as a function of temperature. Unlike the existing theories which describe only the band transport systems, the present theory is applicable to both band and hopping transport systems. Various features of this ’’mobility-induced’’ TSC are illustrated with numerical examples and compared with experiments performed on polymer films (e.g., PVK). These features form the basis of a new method (reported in an earlier paper) for determination of the activation energy, and a technique for studying very low mobilities and/or very low field transport phenomena. It is also found that an observation of shift in TSC peak temperature with applied field does not necessarily imply a field-dependent activation energy.
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