Patent ID: 6130130
Filing Date: 2000-10-10
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device having a first element and a second element comprising steps of;step for preparing a semiconductor substrate having a first device formation region for forming the first element and a second device formation region for forming the second element,step for forming a lower conductive layer on the first device formation region and the second device formation region of the semiconductor substrate,step for forming an insulating layer for forming a second inter-layer film on the lower conductive layer,step for removing the layer for forming the second inter-layer film on the first device formation region,step for forming a first lower conductive film by removing the lower conductive layer on the first device formation region partially,step for forming a first inter-layer film made of a insulating material so as to cover the first lower conductive film,step for implanting impurities to the first device formation region using the first lower conductive film and the first inter-layer film as a mask,step for forming an upper conductive layer on the first device formation region and the second device formation region,step for forming a first upper conductive film by removing the upper conductive layer on the first device formation region partially, and forming a second upper conductive film, a second inter-layer film and a second lower conductive film by removing the upper conductive layer, the layer for forming the second inter-layer film and the lower conductive layer on the second device separation region partially,characterized in that the first inter-layer film is formed thicker than the second inter-layer film, and thickness of the first inter-layer film is sufficient enough to trap impurities within the first inter-layer film when the impurities are implanted to the first device formation region.