Patent ID: 7364980
Filing Date: 2008-04-29
Classification: C30B,H01L

Abstract:
1. A method for manufacturing a semiconductor substrate comprising growing an epitaxial layer ( 11 ) on the surface of a silicon substrate ( 13 ), forming a trench ( 14 ) in the epitaxial layer ( 11 ), and circulating a gas to grow the epitaxial film ( 12 ) in the inside of the trench ( 14 ) and filling the inside of the trench ( 14 ) with the epitaxial film ( 12 ), wherein the aspect ratio (B/A) of the trench ( the gas is a mixed gas prepared by mixing a halogenoid gas into a silicon source gas and the gas is circulated as a material gas at least in the final step of filling the inside of the trench ( when the standard flow rate of the halogenoid gas is defined as Xslm, and the film formation speed of the epitaxial film (