Patent ID: 7863188

Claim:
A method for manufacturing a semiconductor device comprising the steps of: forming an insulating film over a substrate having at least one depression, wherein the insulating film covers an upper surface of the substrate and the depression; forming at least one thin film transistor over the insulating film wherein the thin film transistor includes at least source and drain regions; forming an interlayer insulating film over the thin film transistor wherein the interlayer insulating film covers the depression of the substrate; forming a first opening in the interlayer insulating film to reach one of the source and drain regions of the thin film transistor; forming a second opening in the interlayer insulating film, the second opening being provided over the depression; forming a conductive film over the interlayer insulating film and in the first and second openings wherein the conductive film is connected to the one of the source and drain regions through the first opening and is formed in the depression; and thinning the substrate from a back surface of the substrate so that a portion of the conductive film is exposed.