Patent ID: 7795147
Filing Date: 2010-09-14
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device comprising: forming a conductor pattern over a semiconductor substrate; forming over the conductor pattern a first insulation film; forming a conductive region in the semiconductor substrate; forming, over the semiconductor substrate with the conductor pattern, the conductive region and the conductor pattern formed, a second insulation film having etching characteristics different from those of the first insulation film and having a planarized surface; forming over the second insulation film a third insulation film having etching characteristics different from those of the second insulation film; forming over the third insulation film a fourth insulation film having etching characteristics different from those of the third insulation film; forming over the fourth insulation film a mask layer; forming a hole reaching down to the conductive region in the fourth insulation film, the third insulation film and the second insulation film, forming the hole including a first step of etching the fourth insulation film, a second step of etching the third insulation film and a third step of etching the second insulation film, an etching condition at the first step being different from that at the second step, in the third step of etching the second insulation film, the second insulation film being etched with the first insulation film as an etch stopper; forming a conductive material in the hole to form a contact conducting film of the conductive material, the contact conducting film being electrically connected to the conductive region; forming over the fourth insulation film an interconnection pattern electrically connected to the contact conducting film; and forming a fifth insulation film over the interconnection pattern.