Patent ID: 9595532
Date: 2017-03-14
CPC Classifications: G11C,H01L

Claim:
1. A semiconductor device having a memory cell of a nonvolatile memory, comprising: a semiconductor substrate; a first gate electrode formed over the semiconductor substrate via a first gate insulating film to be included in the memory cell; and a second gate electrode formed over the semiconductor substrate via a multi-layer insulating film to be adjacent to the first gate electrode via the multi-layer insulating film and included in the memory cell, wherein the multi-layer insulating film includes a first silicon dioxide film, a first silicon nitride film over the first silicon dioxide film, and a first insulating film over the first silicon nitride film, wherein the first silicon nitride film has a charge storing function, wherein the first insulating film includes a silicon oxynitride film, wherein the second gate electrode has a lower surface facing the semiconductor substrate, a first side surface adjacent to the first gate electrode via the multi-layer insulating film, and a second side surface opposite to the first side surface, wherein, between the lower surface of the second gate electrode and the semiconductor substrate, a first end portion of the first silicon nitride film and a second end portion of the first insulating film are located closer to the first side surface than a third end portion of the lower surface of the second gate electrode which is closer to the second side surface, and wherein, between the lower surface of the second gate electrode and the semiconductor substrate, in a region where the multi-layer insulating film is not formed, a second silicon dioxide film is embedded.