Patent ID: 8338953
Filing Date: 2012-12-25
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first wiring layer formed over a semiconductor substrate; a dielectric film formed over the first wiring layer; a first opening formed in the dielectric film; a second opening formed in the first opening and reaching the first wiring layer; a first metal film containing a first metal and formed at a bottom and a sidewall of the first opening and at a sidewall of the second opening; a second metal film containing a second metal and formed at the bottom and the sidewall of the first opening and at the bottom and the sidewall of the second opening, wherein a bottom of the second opening is free of the first metal; a third metal film containing the first metal and the second metal and formed at the sidewall of the second opening; and a conductive material buried in the second opening and the first opening.