Patent ID: 7265060
Filing Date: 2007-09-04
Classification: H01L

Abstract:
1. A method for forming a contact hole on a semiconductor substrate comprising: providing a semiconductor substrate having formed thereon a layer of first material and a second layer of dielectric material formed on the top surface of the layer of first material; providing a first ARC layer on the top surface of the second layer of dielectric material; providing a second ARC layer comprising an organic material on the top surface of the first ARC layer; providing a patterned mask layer on the top surface of the second ARC layer, wherein the patterned mask layer has holes therein, said holes being open to the top surface of the second ARC layer; performing a first anisotropic etching process in an RF or microwave generated plasma to remove the second ARC layer and the first ARC layer at the sites of the holes in said patterned mask layer; continuing said first anisotropic etching process in an RF or microwave generated plasma to remove the second layer of dielectric material at the sites of the holes in said patterned mask layer; performing a second anisotropic etching process in an RF or microwave generated plasma to remove the layer of first material at the sites of etched holes in said second layer of dielectric material; and performing a plasma stripping process to remove the remaining patterned mask layer and the remaining second ARC layer comprising an organic material.