Patent ID: 8784560
Filing Date: 2014-07-22
Classification: C30B

Abstract:
1. A method for producing a crystallized compound semiconductor material of group II-VI, comprising synthesizing said material by fusion and inter-reaction of constituents of the material, said constituents being placed in elementary form constituting a charge into a sealed ampoule, then crystallizing the semiconductor material resulting from the synthesis in liquid form by cooling the ampoule according to a given temperature gradient, wherein the method further comprises: increasing within the charge proportion of one constituent of the constituents of said material beyond stoichiometric proportions of the compound semiconductor material for synthesis, thereby defining an excess of the one constituent; subjecting the sealed ampoule in its entirety so provided with the charge to a temperature higher than or equal to a fusion temperature of the compound semiconductor material for synthesis, inducing actual fusion of the charge and the inter-reaction of its constituents then in liquid form, and conversion to dry vapor of the excess of the one constituent; then subjecting the ampoule to a low temperature gradient and to a gradual drop in said temperature, to induce crystallization of the resulting compound semiconductor material, then in liquid form, in stoichiometric proportion, the excess of said one constituent remaining in dry vapor form; then, after crystallization and beginning of cooling of the semiconductor material, subjecting a part of the ampoule where the crystallized semiconductor material is not present, to a significant drop in temperature operable to modify the vapor pressure state of the excess of the one constituent in order to bring the vapor to a saturated vapor state; and finally, cooling the whole of the ampoule down to ambient temperature.