Patent ID: 6117750
Filing Date: 2000-09-12
Classification: C30B,H01L

Abstract:
Process for obtaining a layer of single-crystal germanium or single-crystal silicon on a substrate of single-crystal silicon or of single-crystal germanium, respectively, comprising:chemical vapour depositing the layer of single-crystal germanium or single-crystal silicon using a mixture of silicon and germanium precursor gases, wherein:a) in the case of deposition of the layer of single-crystal germanium, the deposition temperature is gradually decreased from about 800.degree. C. to about 450.degree. C., while at the same time gradually increasing the Ge/Si weight ratio in the precursor gas mixture from 0 to 100%; andb) in the case of deposition of the layer of single-crystal silicon, the deposition temperature is gradually increased from about 450.degree. C. to about 850.degree. C., while at the same time gradually increasing the Si/Ge weight ratio in the precursor gas mixture from 0 to 100%.