Patent ID: 7994012

Claim:
A method of manufacturing a semiconductor device, comprising a step of forming a plurality of nonvolatile memory cells in a principal plane of a semiconductor substrate, wherein the step of forming the nonvolatile memory cells includes the steps of: (a) forming a first semiconductor region of a first conductivity type in the principal plane of the semiconductor substrate; (b) forming a memory gate electrode across a charge storage film at a position included in the first semiconductor region in a planar view, over the principal plane of the semiconductor substrate; and (c) implanting fluorine into a channel region of the principal plane of the semiconductor substrate by first ion implantation, and then activating the fluorine by a first heat treatment, wherein the channel region is a region located beneath the charge storage film that is formed in the step (b), of the principal plane of the semiconductor substrate, wherein the step (c) is performed at least after the step (a) is finished, and wherein the nonvolatile memory cell performs memory operations by transferring a charge to/from the charge storage film.