Patent ID: 7655528

Claim:
A manufacturing method of a semiconductor device comprising the steps of: (a) preparing a first raw material gas which contains a silane-based compound gas containing carbon atoms with the first concentration of 0.3% or more in a first hydrogen gas; (b) producing a first diluted raw material gas containing the silane-based compound gas with the second concentration lower than the first concentration by diluting the first raw material gas with a second hydrogen gas; (c) supplying, after the step (b), a first portion of the first diluted raw material gas into the inside of a reaction chamber in which a wafer to be processed is accommodated, through a mass flow controller; and (d) forming a SiGe:C epitaxial layer or a SiGe:C-based epitaxial layer on a first main surface of the wafer to be processed using a gas containing germanium atoms and the first portion of the supplied first diluted raw material gas supplied through the mass flow controller, wherein a remaining second portion of the first diluted raw material gas is not supplied to the inside of the reaction chamber through the mass flow controller, and is discharged without flowing through the mass flow controller.