Patent ID: 6281097
Filing Date: 2001-08-28
Classification: H01L

Abstract:
A method of fabricating a semiconductor device, comprising:forming an insulating film on a silicon substrate;forming an electrically conductive film on said insulating film;forming a first opening in said insulating film and a second opening in said electrically conductive film, said second opening having a smaller length than said first opening so that tunnel portions are formed in said insulating film below said electrically conductive film; andforming a Si.sub.1-x Ge.sub.x base epitaxial layer on said silicon substrate in said first opening of said insulating film,wherein said Si.sub.1-x Ge.sub.x base epitaxial layer has a first thickness in said first opening and a second thickness, larger than said first thickness, in said tunnel portionswherein a process gas for growing said Si.sub.1-x Ge.sub.x base epitaxial layer comprises disilane and an etching gas comprises chlorine,wherein a ratio of said chlorine to said disilane is equal to or greater than 1/50, and a growth temperature is equal to or smaller than 640 degrees centigrade.