Patent ID: 6489212
Filing Date: 2002-12-03
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, the method comprising:providing a first conduction type substrate; forming a second conduction type well at a surface of the first conduction type substrate; forming mask pattern layer on at least one region of the substrate; using the mask pattern layer in selectively oxidizing the substrate to form a first insulating film having at least one gap corresponding to the mask pattern layer; forming a conductive layer on the mask pattern layer and the first insulating film; forming a second insulating film on an entire surface of the substrate inclusive of the conductive layer; selectively removing the second insulating film, the conductive layer and the mask pattern layer to form a contact hole that exposes the well in the substrate; forming third insulating film sidewalls against both edges of the second insulating film, the conductive layer and the first insulating film in the contact hole; and forming a first semiconductor layer of a first conductive type in the contact hole on the well in the substrate to the same height as the first insulating film.