Patent ID: 6664177
Filing Date: 2003-12-16
Classification: H01L

Abstract:
A method of improving photolithography patterning process in a damascene process, by use of anti-reflective coating layers, the method comprising:forming an etch-stop layer over an underlying semiconductor substrate that contains integrated circuit elements or over a metal layer; forming an intermetal dielectric layer over the etch-stop layer; forming a first anti-reflection coating layer on the intermetal dielectric layer; forming a second anti-reflection coating layer on the first anti-reflection coating layer; forming a layer of photoresist on the second anti-reflection coating layer; exposing selected regions of the photoresist layer to ultraviolet light using a photo mask to form exposed regions and unexposed regions; removing the exposed selected regions of the photoresist layer by developing, thus providing a patterned photoresist mask for subsequent selective removal of exposed regions of the first and second anti-reflection coating layers, and for subsequent selective removal of exposed regions of the intermetal dielectric layer forming a via opening.