It is deduced from the correlation among current-voltage characteristics, photoconductivity spectra, and Fermi-level energy that the current-voltage characteristics of chromium-doped semi-insulating GaAs are dominated by the concentration ratio of the deep level related with chromium to the deep level related with oxygen. This correlation is explained by a space-charge-limited current model.
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Kitahara et al. (1978) studied this question.
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