Patent ID: 7348245
Filing Date: 2008-03-25
Classification: G11C,H01L

Abstract:
1. A manufacturing method of a semiconductor device for forming a rewritable nonvolatile memory cell including a first field effect transistor for memory, forming a circuit including a second field effect transistor and forming a circuit including a third field effect transistor, comprising the steps of: (a) forming a first gate insulating film of the first field effect transistor over a semiconductor substrate; (b) forming a second gate insulating film of the second field effect transistor over the semiconductor substrate; (c) forming a third gate insulating film of the third field effect transistor over the semiconductor substrate; (d) forming a first gate electrode of the first field effect transistor over the first gate insulating film; (e) forming a second gate electrode of the second field effect transistor over the second gate insulating film; (f) forming a third gate electrode of the third field effect transistor over the third gate insulating film; (g) forming first sidewall spacers over the sidewalls of the first gate electrode; (h) forming second sidewall spacers over the sidewalls of the second gate electrode; and (i) forming third sidewall spacers over the sidewalls of the third gate electrode, wherein the third gate insulating film is formed to have a thickness larger than the thickness of the second gate insulating film, wherein the third gate electrode is formed to have a length smaller than the length of the first gate electrode and larger than the length of the second gate electrode, and wherein the first sidewall spacers and the third sidewall spacers are formed such that the width of each is larger than the width of the second sidewall spacers, respectively.