Patent ID: 6858491

Claim:
A method of manufacturing a semiconductor device, comprising: forming a trench in an SOI substrate, the trench extending from a major surface of the SOI substrate and passing through a buried insulating film; forming a first insulating film in the trench, a first insulating film with a depth to reach an upper surface of the buried insulating film; forming a second insulating film in a sidewall portion of the trench above the first insulating film, the second insulating film made of a material different from that of the first insulating film; etching back the first insulating film to such a depth as to reach an upper surface of the buried insulating film, using the second insulating film as a mask, and recessing the buried insulating film exposed to the sidewall portion of the trench; forming a semiconductor layer by epitaxial growth in a gap created by the recessed buried insulating film; and removing the first insulating film and the second insulating film and forming a trench capacitor in the trench.