Patent ID: 8580662
Filing Date: 2013-11-12
Classification: H01L

Abstract:
1. A manufacture method of a semiconductor device, said manufacture method comprising steps of: (a) forming a first insulating film on a semiconductor substrate; (b) forming a polysilicon film on said first insulating film; (c) implanting first dopants into said semiconductor substrate to form a first channel region after said (b) step; (d) etching said polysilicon film after said (c) step; (e) forming a first diffusion region adjacent to said first channel region after said (d) step, said first diffusion region being used as a source or a drain; (f) implanting second dopants of the same conductive type as said first dopants into a portion of said semiconductor substrate after said (e) step to form a second channel region including said second dopants and a third channel region positioned between said first and second channel regions and including said first and second dopants, said portion of semiconductor substrate partially overlapping said first channel region, and said third channel region having a higher impurity concentration than those of said first and second channel regions; (g) etching said polysilicon film after said (f) step to form a floating gate which is formed as a portion of said polysilicon film; (h) forming a control gate positioned adjacent to said floating gate across a second insulating film after said (g) step; and (i) after said (h) step, forming a second diffusion region which is used as a drain or a source in a region adjacent to said second channel region, so that said second channel region is positioned between said third channel region and said second diffusion region.