Patent ID: 7157344
Filing Date: 2007-01-02
Classification: C30B,H01L

Abstract:
1. A vapor-phase growth method comprising: introducing silicon raw material gas into a reaction furnace at an increasing flow rate such that a silicon raw material gas partial pressure increases in proportion to time from an initial gas partial pressure of about 1.33 to 8 Pa to a final gas partial pressure of about 5.33 to 32 Pa to thereby deposit a first semiconductor layer of a silicon layer on a semiconductor substrate using reduced pressure chemical vapor deposition; introducing silicon raw material gas and germanium raw material gas into said reaction furnace in such a manner that a desired germanium concentration may be obtained to thereby deposit a second semiconductor layer of a silicon-germanium mixed crystal layer on said first semiconductor layer using reduced pressure chemical vapor deposition; and introducing silicon raw material gas into said reaction furnace using reduced pressure chemical vapor deposition to thereby deposit a third semiconductor layer of a silicon layer on said second semiconductor layer.