Patent ID: 7429520
Filing Date: 2008-09-30
Classification: H01L

Abstract:
1. A method of forming an isolation film of a semiconductor device, comprising: forming a patterned pad film comprising a pad nitride film on a semiconductor substrate; forming a trench through the patterned pad film defining an inactive region and an active region; forming a liner film on the resulting structure; forming an insulating film in the trench; stripping the liner film disposed outside of the trench and on top of the patterned pad film leaving liner film disposed inside the trench and in sidewalls of the pad film intact; forming a sacrificial film on the resulting structure; and performing a dry etch process on the resulting structure until the semiconductor substrate of the active region is exposed, thereby forming the isolation film having an upper surface that is coplanar with the semiconductor substrate of the active region, comprising performing the dry etch process using a gas having a high selectivity ratio between the sacrificial film and the insulating film for trench burial.