Patent ID: 8044489

Claim:
A semiconductor device comprising: a semiconductor substrate; a select transistor formed on a main surface of the semiconductor substrate; an interlayer dielectric film provided above the select transistor; a plug selectively provided so as to penetrate through the interlayer dielectric film and having an end electrically connected to the select transistor; a chalcogenide material layer electrically connected to the other end of the plug and provided so as to extend on the interlayer dielectric film; and a top electrode provided on the chalcogenide material layer, wherein the interlayer dielectric film contains fluorine, a fluorine concentration in an interface between the interlayer dielectric film and the chalcogenide material layer is higher than a fluorine concentration in an interface between the chalcogenide material layer and the top electrode, a fluorine concentration at an upper portion of the interlayer dielectric film is higher than a fluorine concentration at a lower portion of the interlayer dielectric film, and the fluorine concentration at the upper portion of the interlayer dielectric film is the highest fluorine concentration in the interlayer dielectric film, wherein a fluorine concentration inside the interlayer dielectric film is gradually lowered from the upper portion of the interlayer dielectric film to the lower portion of the interlayer dielectric film.