Importance

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Abstract

An improvement is achieved in the reliability of a semiconductor device. Over a semiconductor substrate, a silicon film, for the memory gate electrode of a memory cell in a nonvolatile memory is formed via an insulating film so as to cover the control gate electrode of the memory cell. After the silicon film and the insulating film are removed from a peripheral circuit region, a silicon film for the gate electrode of a MISFET is formed over the silicon film over a memory cell region of the semiconductor substrate and over the peripheral circuit region thereof. After the silicon film is patterned to form a gate electrode over the peripheral circuit region, the insulating film is removed from the memory cell region. Then, over the silicon film over the memory cell region, an oxide film is formed. Subsequently, the oxide film, and, the silicon film over the silicon film over the memory cell region are etched back to form the memory gate electrode adjacent to the control gate electrode via the insulating film.

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First Claim