Patent ID: 7973415
Filing Date: 2011-07-05
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: (a) forming an interlayer insulating film on a semiconductor element formed on a first surface of a semiconductor substrate, and forming a pad electrically connected to the semiconductor element via a wiring formed in the interlayer insulating film on a surface of the interlayer insulating film; (b) forming a first resist film on a second surface of the semiconductor substrate on a side opposite to the first surface; (c) patterning the first resist film to form a first opening at a position facing to the pad; (d) forming a first hole, which exposes the interlayer insulating film on a bottom surface, in the semiconductor substrate by etching the semiconductor substrate with using the first resist film, in which the first opening is formed, as a mask; (e) removing the first resist film; (f) etching the interlayer insulating film exposed on the bottom surface of the first hole, thereby forming the bottom surface of the first hole at a position on the interlayer insulating film and closer to the pad than an interface between the semiconductor substrate and the interlayer insulating film; (g) forming an insulating film on the second surface of the semiconductor substrate including an inner wall of the first hole; (h) forming a second resist film on the insulating film; (i) patterning the second resist film to form a second opening with a diameter smaller than that of the first hole in the bottom surface of the first hole; (j) forming a second hole, which exposes the pad on a bottom surface, by etching the insulating film and the interlayer insulating film with using the second resist film, in which the second opening is formed, as a mask; and (k) forming a conductive film on the second surface of the semiconductor substrate including an inner wall of the first hole and an inner wall of the second hole and then patterning the conductive film, thereby forming a through silicon via reaching the first surface from the second surface of the semiconductor substrate and electrically connected to the pad, wherein a surface of the interlayer insulating film on a side of the semiconductor substrate has a step shape reflecting a step difference between the bottom surface of the first hole and the first surface of the semiconductor substrate, and a surface of the conductive film has a step shape reflecting a step difference between the second surface of the semiconductor substrate and the bottom surface of the first hole.