Patent ID: 8598680
Filing Date: 2013-12-03
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a first insulating film formed over the semiconductor substrate; a first electrical fuse formed over the first insulating film, the first electrical fuse having a first polysilicon film and a first metal silicide film formed over the first polysilicon film; a second electrical fuse formed over the first insulating film, the second electrical fuse having a second polysilicon film and a second metal silicide film formed over the second polysilicon film; and a second insulating film formed over the first electrical fuse and the second electrical fuse, wherein the first electrical fuse and the second electrical fuse are cut when a prescribed electric current is applied, wherein, in the first electrical fuse, both the first metal silicide film and the first polysilicon film are cut and, in the second electrical fuse, neither the second metal silicide film nor the second polysilicon film is cut, wherein a first end of the first electrical fuse is connected to a first positive pole, wherein a second end of the first electrical fuse is disposed on an opposite end of the first end, wherein, in the first electrical fuse, the prescribed electric current flows from the first end to the second end, wherein in the first electrical fuse is cut in a first position by electromigration, wherein a first length between the first posoition and the first end is shorter than a second length between the first position and the second end, and wherein the first position at which the first electrical fuse is cut is where the first metal silicide film is melted by the electromigration, thereby to form an air gap.