Abstract
Preparation of single crystals of LaCuOS, that is a transparent p-type semiconductor exhibiting violet-light emission, was demonstrated by the flux method using NaCl+KCl(1:1) as flux. The crystals were grown in an alumina tube inserted in an evacuated silica glass tube using the starting materials of La 2O 2S and Cu 2S, as well as the flux and a small amount of K 2S that reduces the coloration of crystals. Transparent colorless laminate crystals were obtained under the optimized crystal growth conditions; growth temperature 850 °C, growth time of 72 h and cooling rate 10 °C h −1. The size of the largest colorless crystal was 3.0×2.8×0.049 mm 3. The crystal showed transmission as high as 60% and p-type electrical conductivity of 7.1×10 −4 S cm −1 at room temperature.
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