Patent ID: 7906434
Filing Date: 2011-03-15
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method comprising: depositing a first insulating film and a second insulating film above a substrate sequentially and forming a pattern on the second insulating film; forming a silicon film on the pattern; forming a sidewall made of the silicon film by processing the silicon film until a part of the second insulating film is exposed by use of etch-back; removing the second insulating film; and performing dry etching by use of a fluorocarbon-based gas, to process the first insulating film by using the sidewall as a mask, wherein processing of the first insulating film comprises applying on the substrate a self-bias voltage Vdc that satisfies a relational expression of Vdc<46x−890, where a film thickness of the silicon film that constitutes the sidewall is x nm (19.5≦x≦22.1).