Patent ID: 7705392
Filing Date: 2010-04-27
Classification: H01L

Abstract:
1. A nonvolatile semiconductor device, comprising: a semiconductor substrate having a main surface; first and second floating gates formed spaced apart from each other on the main surface of said semiconductor substrate; first and second control gates respectively located on said first and second floating gates; a first insulation film formed on said first control gate; a second insulation film formed on said second control gate to contact said first insulation film; and a gap portion formed at least between said first floating gate and said second floating gate by achieving contact between said first insulation film and said second insulation film, wherein a third insulation film is formed on surfaces of said first insulation film and said second insulation film to cover a contact portion between said first insulation film and said second insulation film, and said contact portion is sealed by said third insulation film being different from said first and second insulation films in material.