Abstract
CuInS 2 crystals were successfully grown by a hot-press method at 700°C for 1 h under high pressure (10–100 MPa). The size of each sample was 20 mm in diameter. All samples were shown to have chalcopyrite structures and were nearly stoichiometry and n-type by means of X-ray diffraction, electron probe microanalysis and thermoprobe analysis, respectively. However, the sample grown at 400°C also had a different phase (CuIn 11S 17). The sample did not change phase with increasing temperature. CuInS 2 crystals could be obtained at 700°C. The samples had both donor- and acceptor-type impurities since donor–acceptor pair band emission was clearly observed in the photoluminescence spectra at 10 K.
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