Patent ID: 6737349
Filing Date: 2004-05-18
Classification: H01L

Abstract:
A method of forming a copper wiring in a semiconductor device comprising:providing a semiconductor substrate on which a lower metal wiring is formed; forming a low dielectric constant film on the substrate including the lower metal wiring; forming a hard mask layer on the low dielectric constant film; forming a photoresist pattern on the hard mask layer and then etching a portion of the low dielectric constant film by means of an etch process using the photoresist pattern as a mask, thus forming a damascene pattern, whereby a polymer defined by a formula CFXHY is generated in the etch process of forming the damascene pattern and said CFXHY polymer sticks to sides of the damascene pattern to form a CFXHY polymer layer thereon; converting the CFXHY polymer layer to a SiCH film using a SiH4 plasma and then removing the photoresist pattern; and forming a copper layer on the entire structure including the low dielectric constant film surrounded by the hard mask layer and the SiCH film and then polishing the copper layer by means of a chemical mechanical polishing process to form a copper wiring.