Patent ID: 7501347
Filing Date: 2009-03-10
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device including the following steps of: (a) forming a plurality of interconnection trenches in a first insulative film above a semiconductor substrate; (b) forming a first conductor film above the first insulative film including the inside of each of the plurality of the interconnection trenches; (c) removing the first conductor film outside of the plurality of the interconnection trenches by a CMP method thereby forming an interconnection comprising the first conductor film in the inside of each of the plurality of the interconnection trenches; (d) forming a first barrier insulative film above the first insulative film and the plurality of the interconnections; (e) leaving the first barrier insulative film and the first insulative film in a peripheral region of a through hole formed in a step (h), where an interconnection interval is narrow in the peripheral region, and removing the first barrier insulative film and the first insulative film in a region other than the peripheral region; (f) forming a second barrier insulative film above the first barrier insulative film and on the lateral surface and above the upper surface of the interconnection; (g) forming a second insulative film above the second barrier insulative film while leaving an air gap in the space region between the interconnections from which the first barrier insulative film and the first insulative film have been removed; (h) forming the through hole that penetrates the first barrier insulative film, the second barrier insulative film and the second insulative film above the interconnection and exposes an upper surface of the interconnection; and (i) forming a second conductor film to the inside of the through hole.