Patent ID: 6825118
Filing Date: 2004-11-30
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising:forming a laminated film including a thermal oxide film, a non-single-crystal silicon film, and a silicon nitride film on a substrate; patterning the laminated film; forming an element-isolating trench in the substrate using the laminated film, after patterning, as a mask; depositing a buried oxide film in the element-isolating trench; after depositing the buried oxide film, removing portions of the buried oxide film by chemical-mechanical polishing, thereby exposing the silicon nitride film; removing, after exposing, the silicon nitride film; after removing the silicon nitride film, removing portions of the buried oxide film by chemical-mechanical polishing, using the non-single-crystal silicon film as a stopper film; and removing the non-single-crystal silicon film and the thermal oxide film.