Patent ID: 7919397

Claim:
A method for manufacturing a semiconductor device by forming an epitaxial layer as a semiconductor layer on a Si layer of an SOI substrate which has an insulation layer and a Si layer sequentially stacked on a Si substrate, comprising: a temperature-raising step of heating and temperature-raising the SOI substrate to an epitaxial growth temperature which is an agglomeration temperature of the Si layer or more, and a step of epitaxially growing the semiconductor layer on the temperature-raised Si layer, wherein the temperature-raising step includes a step of supplying a hydride gas of Si or Ge and a halogen-atom-containing gas prior to the epitaxial growth to terminate dangling bonds of the Si layer by H atom and Si or Ge dissociated from the hydride gas and to etch Si or Ge formed on the Si layer by the halogen-atom-containing gas so that the Si or Ge is not deposited on the Si layer.