Patent ID: 8426291
Filing Date: 2013-04-23
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, the method comprising: a step of preparing a semiconductor substrate having a first face and a second face, wherein a first insulating film, a polysilicon film, and a second insulating film are formed on the first face in an order of the first insulating film, the polysilicon film, and the second insulating film from the first face, and a polysilicon film and a second insulating film are formed on the second face in an order of the polysilicon film and the second insulating film from the second face; an isolation forming step of forming isolation, the isolation forming step including a process of etching the second insulating film on a side of the first face using a mask including an opening, wherein the isolation is defined by the opening and is formed in the first face of the semiconductor substrate; a second insulating film removing step of removing the second insulating films on the side of the first face and a side of the second face after the isolation forming step; and a polysilicon film removing step of removing the polysilicon film on the side of the first face.