Growth and properties of single crystals of group I-III-VI2 ternary semiconductors

Single crystals of five members of the I-III-VI 2 ternary semiconductors have been grown by iodine vapour transport and variations of growth are reported. The measured energy gaps are 2·44 eV (CuGaS 2 ), 2·06 eV (CuAlTe 2 ), 2·51-2·61 eV (AgGaS 2 ), 3·13 eV (AgAlS 2 ) and 2·55 eV (AgAlSe 2 ). The refractive index for CuGaS 2 varies from 2·825 at 525 nm to 2·660 at 661 nm with refractive indices of 2·720 and 2·724 for two polarizations at 589·2 nm.