Patent ID: 8530308
Filing Date: 2013-09-10
Classification: H01L

Abstract:
1. A fabrication method of a semiconductor integrated circuit device comprising: forming a first well in a semiconductor substrate, which includes a first device region, a second device region and a third device region, of said first device region by performing an ion implantation; forming a first gate insulation film on said semiconductor substrate of said first device region; forming a floating gate on said first gate insulation film; forming a dielectric film on said floating gate; forming, after forming said dielectric film, a second well in said semiconductor substrate of said second device region and a third well in said semiconductor substrate of said third device region; forming a second gate insulation film on said semiconductor substrate of said second well and said third well; removing said second gate insulation film of said third device region; forming a third gate insulation film of a thickness different from a thickness of said second gate insulation film on said semiconductor substrate of said third device region after removing said second gate insulation film of said third device region; forming a control gate, first gate electrode and second gate electrode on said dielectric film, said second gate insulation film and third gate insulation film respectively.