Patent ID: 7645674
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first film and a second film on a semiconductor substrate; removing the second film, the first film and the semiconductor substrate to form a first isolation trench, and forming a first element region, a first gate insulating film and a first gate electrode, which are isolated via the first isolation trench; removing the second film, the first film and the semiconductor substrate to form a second isolation trench, and forming a second element region, a second gate insulating film and a second gate electrode, which are isolated via the second isolation trench; and forming a first oxide film on a sidewall of the first element region while forming a second oxide film on a sidewall of the second element region, wherein the first isolation trench has a width narrower than the second isolation trench, the first oxide film has a thickness thinner than the second oxide film, the first gate electrode contacting with the first gate insulating film has a width narrower than the first element region contacting with the first gate insulating film in a channel width direction of the first element region, and the second gate electrode contacting with the second gate insulating film has a width narrower than the second element region contacting with the second gate insulating film in a channel width direction of the second element region.