Patent ID: 7026248

Claim:
A method for manufacturing a semiconductor device comprising: forming a trench in a semiconductor substrate; forming a first epitaxial layer formed of a first conductive type semiconductor on the semiconductor substrate including the trench by epitaxial growth; removing a portion of the first epitaxial layer by vapor phase etching using a halogenated compound or hydrogen; forming a second epitaxial layer formed of the first conductive type semiconductor on the semiconductor substrate including the trench by epitaxial growth to cover the first epitaxial layer; forming a third epitaxial layer formed of a second conductive type semiconductor on the semiconductor substrate including the trench by epitaxial growth to cover the second epitaxial layer; forming a fourth epitaxial layer formed of the first conductive type semiconductor on the semiconductor substrate including the trench by epitaxial growth to cover the third epitaxial layer; and flattening surfaces of the first to fourth epitaxial layers formed on the semiconductor substrate; wherein the removing includes removing the portion of the first epitaxial layer at a predetermined temperature higher than that during epitaxial growth of the first epitaxial layer and at a predetermined pressure higher than that during epitaxial growth of the first epitaxial layer.