Patent ID: 9306053
Filing Date: 2016-04-05
CPC Classification: H01L

Claim Text:
1. A method of producing a semiconductor device, the method comprising: a first step of forming a fin-shaped silicon layer on a silicon substrate using a first mask and forming a first insulating film around the fin-shaped silicon layer; and a second step of forming a second insulating film around the fin-shaped silicon layer and etching the second insulating film so that the second insulating film is left on a side wall of the fin-shaped silicon layer, depositing a third insulating film on the second insulating film, the fin-shaped silicon layer, and the first insulating film, depositing polysilicon on the third insulating film, planarizing a surface of the polysilicon, and subsequently etching back the polysilicon to thereby expose the third insulating film located on an upper portion of the fin-shaped silicon layer, forming a second resist used for forming a gate line and a pillar-shaped silicon layer so as to extend in a second direction perpendicular to a first direction in which the fin-shaped silicon layer extends, etching the third insulating film and the second insulating film and then etching the fin-shaped silicon layer and the polysilicon by using the second resist as a second mask, and further removing the second insulating film to thereby form the pillar-shaped silicon layer and a dummy gate formed of the polysilicon.