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We discuss an alternative to the current views on the origin of the exponential band tail in amorphous semiconductors. Our model is based on the potential fluctuations due to randomly distributed charges. We show that with random charges, the exponentiality of the band tail is a consequence of the exponential distribution of charged cluster sizes and of the minimal separation between localized states and charged clusters.
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Kemp et al. (1993) studied this question.
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