Extra electrons forced into polycrystalline CdS from ohmic indium electrodes result in space-charge-limited current. The transient current resulting from a step voltage is measured and found to decay in a dispersive form of t−(1−α) over several orders of magnitude in time. This dispersive decay is attributed to extensive trapping and detrapping of the electrons and is analyzed in terms of the stochastic transport theory of Scher and Montroll [Phys. Rev. B 12, 2455 (1975)].
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Yicheng Wang (1994) studied this question.
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