Patent ID: 7358602

Claim:
A semiconductor chip comprising: a semiconductor substrate; an integrated circuit, at least a part of the integrated circuit being formed in the semiconductor substrate; a penetrating electrode which is formed in a through-hole of the semiconductor substrate from a first surface to a second surface of the semiconductor substrate, the through-hole having sidewalls entirely orthogonal to the first and second surface, and the penetrating electrode having a projection which projects from the second surface; and an insulating layer formed over an entire surface of the second surface of the substrate, the insulating layer including a first insulating section formed in a region that surrounds the projection such that the projection forms a through-bore in the first insulating section above the second surface of the substrate, and a second insulating section that covers a remaining region of the second surface of the semiconductor substrate, the first insulating section being connected to the second insulating section by a radially tapering arcuate portion having a varying radius of curvature from the through-bore to the second insulating section; wherein the second insulating section is formed to be thinner than a thickest area of the first insulating section.