Patent ID: 6680238
Filing Date: 2004-01-20
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device comprises:sequentially forming a pad oxide layer, a nitride layer and a first photoresist layer on a semiconductor substrate; patterning the first photoresist layer into a predetermined shape to form a first photoresist layer pattern; etching the pad oxide layer, the nitride layer and the semiconductor substrate by using the first photoresist layer pattern as an etching mask, thereby forming first and second deep trench isolation regions in the semiconductor substrate; removing the first photoresist layer pattern and forming a second photoresist layer pattern over the first deep trench isolation region and then forming a barrier layer on an inside wall of the second deep trench isolation region by performing a nitriding process; forming a shallow trench isolation by removing the second photoresist layer pattern and then growing silicon in the first deep trench isolation region covered with the second photoresist layer pattern by performing a silicon epitaxial growth process.