Abstract
SnS and SnSe were purified by distillation. Single crystals grown from the purified material contained less than 2.5 × 10 16 cm −3 impurities (spectrochemical analysis). The solid-liquid equilibrium SnS-SnSe was determined. It was found that the two compounds form a continuous series of mixed crystals, with a minimum melting point of 853°C at a composition SnS 0.5Se 0.5. The S and Se atoms in the mixed crystals are randomly distributed. The dimensions of the crystallographic unit cell of mixed crystals SnS 1− x Se x vary linearly with the composition x. The crystals were all p-type with p ∼ 10 18 cm −3. At 300°K, the mobility perpendicular to the c-axis as a function of the composition shows a single minimum of 65 cm 2/V sec for SnS 0.7Se 0.3, the corresponding values for SnS and SnSe being respectively 90 and 115. The mobility varies approximately with T −2, indicating lattice scattering. For all crystals the band-edge absorption was found to be due to allowed indirect transitions. The bandgap of SnS and SnSe at 300°K is 1.08 and 0.90 eV respectively. The bandgap of mixed crystals SnS (1− x) Se x varies linearly with x.
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