Patent ID: 7371680
Filing Date: 2008-05-13
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming an interlayer insulating film on a conductive portion formed in a semiconductor substrate which is placed in a chamber; forming a contact hole to pass through said interlayer insulating film to said conductive portion; forming a barrier metal layer to cover a bottom portion and side wall portion of said contact hole; forming a tungsten layer from a material gas containing fluorine to fill said contact hole in which said barrier metal layer has been formed; and removing said fluorine from said tungsten layer through a post purge process, wherein said forming a tungsten layer comprises: introducing an inert gas into said chamber for a first gas purge; introducing a hydrogen gas and a silicon hydride gas into said chamber for a second gas purge after said first gas purge; forming a first tungsten layer of said tungsten layer from a tungsten fluoride gas after said second gas purge; introducing said hydrogen gas and said inert gas into said chamber for a third gas purge after said first tungsten layer is formed; and forming a second tungsten layer of said tungsten layer on said first tungsten layer from said tungsten fluoride gas after said third gas purge, wherein said removing comprises: introducing said hydrogen gas and said inert gas into said chamber for a fourth gas purge; introducing said hydrogen gas and said silicon hydride gas into said chamber for said post purge process to form a silicon layer on said tungsten layer such that silicon in said silicon layer reacts with fluorine in said tungsten layer to form a silicon fluoride layer, after said fourth gas purge; introducing said hydrogen gas and said inert gas into said chamber for a fifth gas purge; and removing said silicon fluoride layer after said fifth gas purge.