Optical and Electrical Properties of CuIn5S8 and AgIn5S8 Single Crystals

The energy gaps at 300 and 96 K of CuIn 5 S 8 and AgIn 5 S 8 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.