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Measurements of dc conductivity (σ) on polycrystalline semiconductors, viz., InSb, Si, and CdTe, have been reported in the temperature range 77–300 K. The conduction mechanism near liquid-nitrogen temperature has been identified as the hopping of charge carriers from the charged trap centers to empty traps near the Fermi level.
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Sharma et al. (1985) studied this question.
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