Patent ID: 7972964
Filing Date: 2011-07-05
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: forming a first conductor on a substrate; depositing a first insulating layer on the first conductor; forming a second insulating layer on the first insulating layer, the second insulating layer having a first contact hole opposite the first conductor; patterning the first insulating layer by using either a photoresist pattern or the second insulating layer as an etch mask to form a second contact hole exposing the first conductor together with the first contact hole; forming a second conductor connected to the first conductor through the first and the second contact holes; and narrowing the second contact hole after patterning the first insulating layer and before forming the second conductor, wherein the first contact hole and the second contact hole form a step structure exposing a top surface of the first insulating layer, wherein narrowing the second contact hole comprises reflowing the second insulating layer.