Patent ID: 8293622

Claim:
A method of manufacturing a semiconductor device comprising: forming a gate electrode over a first semiconductor layer with a gate insulating film therebetween; forming an insulating layer on sides of the gate electrode; forming recesses in the first semiconductor layer using the gate electrode and the insulating layer as masks; and forming a second semiconductor layer having a first portion and a second portion above the first portion in the recesses, the first portion and the second portion being made under a condition that growth selectivity of the first portion with respect to the insulating layer is lower than growth selectivity of the second portion with respect to the insulating layer; wherein: in the forming of the second semiconductor layer, halogen gas is added to material gas for the second semiconductor layer; the first portion and the second portion are made under a condition that a content of the halogen gas at the time of the growth of the first portion is lower than a content of the halogen gas at the time of the growth of the second portion; in the forming of the second semiconductor layer, temperature at the time of the growth of the first portion is set to 550 to 650° C. and temperature at the time of the growth of the second portion is set to 450 to 550° C., and the temperature at the time of the growth of the first portion is set higher than the temperature at the time of the growth of the second portion; the first semiconductor layer is a silicon layer; and the first portion and the second portion of the second semiconductor layer are silicon germanium layers or silicon carbide layers.