Patent ID: 7338850
Filing Date: 2008-03-04
Classification: H01L,Y10S

Abstract:
1. A method for manufacturing a device isolation film of a semiconductor device, comprising: sequentially forming a pad oxide film and a pad nitride film on a semiconductor substrate, wherein the semiconductor substrate comprises a cell region; and a peripheral region including a pMOS region and an nMOS region; etching a predetermined region of the pad nitride film, the pad oxide film and the semiconductor substrate where the device isolation film is to be formed to form a trench; forming a sidewall oxide film on a surface of the trench; sequentially forming a liner nitride film and a liner oxide film on a surface of the semiconductor substrate including the trench and the pad nitride film; removing at least a portion of the liner oxide film in the pMOS region of the peripheral region to expose a portion of the liner nitride film; oxidizing the exposed portion of the liner nitride film; forming a gap-filling oxide film on the semiconductor substrate to substantially fill the trench; performing a planarization process to expose the pad nitride film; and removing the pad nitride film and the pad oxide film.