Patent ID: 7015135
Filing Date: 2006-03-21
Classification: H01L

Abstract:
1. A method for providing at least one contact in a semiconductor including a substrate, an etch stop layer, an interlayer dielectric in contact with the etch stop layer, an anti-reflective coating layer in contact with the interlayer dielectric, and at least one feature below the etch stop layer, a resist mask having at least one aperture therein residing on the anti-reflective coating layer, the least one aperture being above an exposed portion of the anti-reflective coating layer, the method comprising the steps of: (a) etching the exposed portion of the anti-reflective coating layer and the interlayer dielectric below the exposed portion of the anti-reflective coating layer without etching through the etch stop layer to provide a portion of at least one contact hole; (b) removing the resist mask in situ; (c) removing a portion of the etch stop layer exposed in the portion of the at least one contact hole to provide the at least one contact hole in situ; and (d) filling the at least one contact hole with a conductive material.