Patent ID: 6599811
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device comprising the consecutive steps of:heating a silicon substrate to form a pad thermal oxide film directly contacting said silicon substrate, etching a surface region of said silicon substrate to form an isolation trench and retain said pad thermal oxide film in regions apart from said isolation trench, forming a thermal oxide film on an inner wall of said isolation trench and contacting an edge of said pad thermal oxide film at a location apart from the inner wall, depositing a CVD oxide film by a high temperature oxidation technique directly contacting on said thermal oxide film, depositing a bias oxide film overlying said silicon substrate including inside of said isolation trench by a high-density plasma CVD technique, removing a portion of said bias oxide film remaining above a specified level of said silicon substrate to leave said isolation trench filled with said bias oxide film, and forming a plurality of element regions separated by said isolation trench from one another.