Patent ID: 8274155
Filing Date: 2012-09-25
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first insulating layer; an interconnect that is provided in said first insulating layer and has an upper surface which is higher than an upper surface of said first insulating layer; an air gap that is provided between said interconnect and said first insulating layer; an etching stopper film that is formed over said first insulating layer, said air gap, and said interconnect; a second insulating layer that is formed over said etching stopper film; and a via that is provided in said second insulating layer and is connected to said interconnect, wherein a portion of said etching stopper film that is disposed over said air gap is thicker than another portion of said etching stopper film that is disposed over said interconnect, and the portion of said etching stopper film has a same layer structure as said another portion of said etching stopper film that is disposed over said interconnect.