PRODUCTION OF ZNSE BULK SINGLE CRYSTAL

摘要

PROBLEM TO BE SOLVED: To produce a ZnSe bulk single crystal having high purity and quality in a clean environment of h furnace by suppressing the scattering of raw material from a crucible to prevent the loss of the raw material and the variation of the molten liquid composition and preventing the contamination of the crystal with the raw material in the furnace and a material generated from the crucible. SOLUTION: A ZnSe bulk single crystal is produced from a molten liquid by a high-pressure melting method using a vertical Bridgman furnace or a vertical annealing furnace. In the above process, a crucible charged with a seed crystal, a ZnSe raw material and an encapsulant (selected from B2 O3 and fluorine compounds such as CaF2 or AIF3 ) in the order is heated in a high- pressure furnace. The obtained single crystal has extremely low impurity content and high crystallinity.