Patent ID: 7432196

Claim:
A method for manufacturing a semiconductor chip, comprising: a step of forming a front-surface-side concave portion in a semiconductor substrate having a front surface and a rear surface, a functional device being formed on the front surface, the front-surface-side concave portion being formed in the front surface and having a predetermined depth smaller than a thickness of the semiconductor substrate; a dummy plug forming step of supplying nonmetallic material into the front-surface-side concave portion and embedding a dummy plug made of the nonmetallic material in the front-surface-side concave portion; a thinning step of, subsequent to the dummy plug forming step, removing a part of the rear surface of the semiconductor substrate and thinning the semiconductor substrate so that the thickness of the semiconductor substrate becomes smaller than the depth of the front-surface-side concave portion and so that the front-surface-side concave portion is formed into a through-hole that penetrates the semiconductor substrate; a dummy plug removing step of removing the dummy plug provided in the through-hole; and a step of, subsequent to the dummy plug removing step, supplying metallic material into the through-hole and forming a penetration electrode that establishes an electrical connection between a front surface side and a rear surface side of the semiconductor substrate and that is electrically connected to the functional device.