Patent ID: 8298900
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A method of manufacturing a nonvolatile semiconductor storage device, said method comprising: sequentially forming a charge storage film, a conductive film, and a mask film on a semiconductor substrate; sequentially removing the mask film, the conductive film, and the charge storage film at a given portion to form a groove; forming a word gate electrode to fill in the groove whose inside is covered with an insulating film; after said forming the word gate electrode, removing the mask film; after said removing the mask film, forming a spacer film to cover the conductive film and the word gate electrode; etching back the spacer film to form a spacer layer on both sides of the word gate electrode through the insulating film; removing the conductive film and the charge storage film to form a control gate electrode; and forming a source drain diffusion layer.