Abstract
A modified silica capsule is used which enables either semi-insulating or semiconducting cadmium sulphide single crystals to be grown consistently from the vapour phase. The crystals are optically clear, with dimensions typically of 1 cm in diameter by 2–4 cm in length. The semi-insulating crystals are very photoconductive and are particularly suitable for studying the acousto-electric interaction. Various factors affecting the quality of the single crystals are discussed, and the most important of these is the effect of impurities. Progress has recently been made in developing a seeding technique.
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