The energy gaps at 300 and 96 K of CuIn5S8 and AgIn5S8 single crystals were determined from the optical absorption measurements. The peaks of the photoconductive spectra observed at 300 and 77 K were in good agreement with the energy gaps. The resistivity and the mobility for the samples with less sulphur than the stoichiometric one were determined from the electrical measurements.
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Usujima et al. (1981) studied this question.
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