Patent ID: 7419870
Filing Date: 2008-09-02
Classification: H01L

Abstract:
1. A method of manufacturing a flash memory device, the method comprising: forming pluralities of memory cells and selection transistors on a semiconductor substrate; forming a sidewall oxide film and a buffering oxide film that are stacked on an entire surface of the semiconductor substrate including the memory cells and the selection transistors; forming a nitride film on the buffering oxide film; forming a further oxide film on the nitride film; forming spacers comprising the sidewall oxide film, the buffering oxide film, the nitride film, and the further oxide film wherein the nitride film is adjacent to the buffering oxide film, and the oxide film is adjacent to the nitride film on sidewalls of the selection transistors by performing an etch back process after forming the further oxide film; forming an interlevel insulation film on the resulting structure after forming the spacers; forming contact holes between the selection transistors by partially etching the interlevel insulation film; and filling the contact holes to form plugs.