Patent ID: 7018905
Filing Date: 2006-03-28
Classification: H01L

Abstract:
1. A method of forming an isolation film of a semiconductor device, comprising the steps of: forming a pad film on a semiconductor substrate, and patterning the pad film of a predetermined region and a predetermined depth of the semiconductor substrate to form trenches thereby defining a non-active region and an active region; forming sidewall oxide films on sidewalls of the trenches; forming a first oxide film for trench burial on the entire surface including the sidewall oxide films, and then performing a polishing process until the pad film is exposed, thus forming a first isolation film; removing the pad film to expose the semiconductor substrate in the active region; forming a silicon layer, which has a height higher than that of the first isolation film, on the exposed semiconductor substrate in the active region; and forming a second oxide film for trench burial on the entire surface, and then performing a polishing process until the silicon layer is exposed, thus forming a second isolation film, whereby an isolation film in which the first isolation film and the second isolation film are stacked is formed.