Patent ID: 7867853
Filing Date: 2011-01-11
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a pad oxide film and a mask layer over a surface of a semiconductor substrate which is an active region; forming an STI trench by etching the semiconductor substrate with use of the mask layer as an etching mask; forming an STI region surrounding the active region by filling the STI trench with an STI insulating film; after formation of the STI region, in a state of exposing top and side surface of the mask layer, forming a narrowed mask layer by narrowing width and thickness of the mask layer over the pad oxide film so as to expose a peripheral circuit portion of the active region from the mask layer in the plan view; wholly forming an anti-reflective film so as to cover the narrowed mask layer; forming, on the anti-reflective film, a photoresist having a reversed pattern of a gate electrode extending across the active region; exposing the pad oxide film formed over the surface of the peripheral circuit portion of the active region by etching the anti-reflective film whose surface is exposed with use of the photoresist as an etching mask; exposing the surface of the peripheral circuit portion of the active region by etching the exposed pad oxide film; forming a pair of gate trenches and a Fin channel sandwiched between the pair of the gate trenches by etching the peripheral circuit portion of the active region with use of the STI insulating film, the narrowed mask layer, and the photoresist and the anti-reflective film, which are located adjacent to the peripheral circuit portion whose surface is exposed in the plan view, as an etching mask; forming a gate insulating film over a surface of the Fin channel and over a bottom portion of the gate trench; and forming a gate electrode covering the gate insulating film and filling up the gate trench.