Patent ID: 9559101
Date: 2017-01-31
CPC Classifications: G11C,H01L

Claim:
1. A semiconductor device, comprising: a substrate; an etch-stop film formed on the substrate; an interlayer insulating film formed on the etch-stop film, wherein the etch-stop film is between the interlayer insulating film and the substrate, and wherein the interlayer insulating film comprises an impurity-doped region and an undoped region, wherein a dielectric constant of the impurity-doped region is smaller than that of the undoped region; a first contact and a second contact, wherein the first and second contacts are formed in the interlayer insulating film, wherein the impurity-doped region is formed around the contacts in the interlayer insulating film and along a lengthwise direction of the contacts, wherein an upper surface of the impurity-doped region is coplanar with an upper surface of at least one of the contacts, wherein the impurity-doped region comprises a first impurity-doped region formed along a lengthwise direction of the first contact and a second impurity-doped region formed along a lengthwise direction of the second contact, and wherein the undoped region is located between the first impurity-doped region and the second impurity-doped region.