Patent ID: 6849519
Filing Date: 2005-02-01
Classification: H01L

Abstract:
1. A method of forming an isolation layer in a semiconductor device, comprising the steps of: sequentially forming a pad oxide film and a pad nitride film on a semiconductor substrate and then forming an aperture through which an isolation region of the semiconductor substrate is exposed; forming a V-type trench in the isolation region having a sidewall that extends through the pad nitride and the pad oxide films and a V-shaped bottom portion in the substrate; forming an insulating film spacer at the sidewall of the pad nitride film and pad oxide film that defines an aperture leaving the bottom portion of the V-type trench substantially exposed and intact; forming an ion implantation layer for accelerating oxidization at the exposed bottom portion of the V-type trench; forming a first insulating film at the exposed bottom portion V-type trench by means of an oxidization process leaving the insulation spacers substantially exposed; filling the aperture by depositing a second insulating film on top of the first insulating film; and removing the pad nitride film and the pad oxide film.