Patent ID: 6569756
Filing Date: 2003-05-27
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device for forming wiring composed of copper only or materials in which copper forms the principal constituent thereof on a connecting trench or connecting hole of an insulating film covering a semiconductor substrate comprising the steps of:forming, by using a CVD method, a first conductive thin film composed of copper only or materials in which copper forms the principal constituent thereof so as not to cause bumps and dips attributable to crystal particles on the surface of said thin film on said semiconductor substrate containing said connecting trench or connecting hole; reflowing by performing heat treatment on said semiconductor substrate in a mixed reductive and oxidizing atmosphere of hydrogen and oxygen gases, to make the surface of said first conductive thin film smooth, said semiconductor substrate being at a temperature of between 350-650Â° C.; flowing said hydrogen and oxygen gases at a flow rate of between 1000-50000 sccm, said first conductive thin film remaining as a thin film in said reflowing step, said first conductive thin film leaving a substantially uniform gap between walls of said connecting trench or connecting hole; plating a second conductive thin film composed of copper only or materials in which copper forms the principal constituent thereof and having a film thickness that is larger than the depth of said connecting trench or connecting hole on said first conductive thin film; and planarizing said second conductive thin film.