Patent ID: 8236702
Filing Date: 2012-08-07
Classification: H01L

Abstract:
1. A method of fabricating contact holes comprising: providing a semiconductor substrate at least divided into a first device region and a second device region, the semiconductor substrate comprising an etch stop layer and at least a dielectric layer from bottom to top, the etch stop layer covering the first device region and exposing the second device region; patterning the dielectric layer and the etching stop layer to form a plurality of contact holes in the dielectric layer and in the etching stop layer in the first device region and form a plurality of contact holes in the dielectric layer in the second device region, the contact holes formed in the first device region and in the second device region exposing the semiconductor substrate; forming a dielectric thin film covering the dielectric layer, sidewalls of the contact holes, and the semiconductor substrate in the first device region and the second device region; and removing the dielectric thin film disposed on the dielectric layer, and the semiconductor substrate.