Patent ID: 7192863
Filing Date: 2007-03-20
Classification: H01L

Abstract:
1. A method for forming a semiconductor structure, comprising: forming a first opening in a dielectric layer; filling the first opening with a fill material; etching back the fill material to form a fill material plug that resides in the first opening below a top surface of the dielectric layer; and depositing a bottom anti-reflective coating (BARC) layer that fills the first opening above the via fill material plug and overlies at least a portion of the top surface of the dielectric layer; then, etching a portion of the BARC layer that fills the first opening and the dielectric layer to form a second opening overlying the filled first opening with a given dielectric etch chemistry, wherein the fill material etches at an etch rate that is within 60% of an etch rate that the dielectric layer etches for the given dielectric etch chemistry.