Patent ID: 7994000
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first semiconductor film, a second semiconductor film, and a third semiconductor film over a substrate; forming a first insulating film to cover the first semiconductor film, the second semiconductor film, and the third semiconductor film; forming a first conductive film and a second conductive film selectively over the first semiconductor film and the second semiconductor film, respectively, with the first insulating film interposed therebetween; removing the first insulating film which is formed over the third semiconductor film; forming a second insulating film to cover the first conductive film, the second conductive film, and the third semiconductor film; forming a third conductive film over the first conductive film with the second insulating film interposed therebetween; forming a fourth conductive film selectively over the third semiconductor film with the second insulating film interposed therebetween; and doping the first semiconductor film with an impurity element with the third conductive film serving as a mask, doping the third semiconductor film with the impurity element with the fourth conductive film serving as a mask, and doping the second semiconductor film with the impurity element through the second conductive film.