Patent ID: 9590036
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. A contact window structure comprising: a first metal layer positioned on a substrate; a first insulating layer positioned on the first metal layer, wherein the first insulating layer has a first opening, and the first opening exposes a part of the first metal layer; a second metal layer covering the first opening and in contact with the first metal layer via the first opening; a second insulating layer positioned on the first insulating layer, wherein the second insulating layer has a second opening, the second opening exposes the second metal layer and a part of the first insulating layer, and a projection area of the second opening on the first metal layer covers a projection area of the first opening on the first metal layer, and any side edge of the second opening is in contact with the second metal layer; and a third metal layer covering the second insulating layer and the second opening, and in contact with the second metal layer via the second opening.