Patent ID: 7282442
Filing Date: 2007-10-16
Classification: H01L

Abstract:
1. A method of forming a contact hole of a semiconductor device, the method comprising the steps of: forming a gate line and a source/drain region in a substrate; depositing an etch stopper layer on the substrate; depositing a first interlayer dielectric layer on the etch stopper layer and flattening the first interlayer dielectric layer such that a portion of the etch stopper layer above the gate line is exposed; removing the exposed portion of the etch stopper layer; forming a gate protective layer on the gate line; depositing a second interlayer dielectric layer on the substrate; and etching the second interlayer dielectric layer to form a first contact hole on the gate line and consecutively etching the second interlayer dielectric layer, the first interlayer dielectric layer, and the etch stopper layer to form a second contact hole on the source/drain region, wherein the gate protective layer protects the gate line during the formation of the first contact hole and the second contact hole.