Patent ID: 7671360

Claim:
A semiconductor device comprising a lower electrode formed on a semiconductor substrate, an interlayer insulation film formed over the semiconductor substrate and the lower electrode, the interlayer insulation film including a contact hole to expose a part of the lower electrode, a sidewall insulation film formed on a sidewall of the contact hole formed in the interlayer insulation film, a heater electrode formed in the contact hole and located inside the sidewall insulation film such that an upper surface of the heater electrode is lower in level than a top end of the sidewall insulation film, a phase change film formed in contact with the interlayer insulation film, the sidewall insulation film and the part of the heater electrode, and an upper electrode formed on the phase change film, the sidewall insulation film comprising an anti-oxidization insulation film, and the phase change film being in direct contact with the sidewall insulation film without an intervention of an oxide layer.