Patent ID: 11901266
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method for forming a semiconductor device structure, comprising:
providing a chip structure comprising a substrate and a wiring structure over a first surface of the substrate, wherein the chip structure has a hole penetrating through the wiring structure and extending into the substrate;
partially removing the wiring structure adjacent to the hole to widen the hole in the wiring structure, wherein the hole has a first enlarged portion and a neck portion after partially removing the wiring structure adjacent to the hole, and the first enlarged portion is wider than the neck portion;
forming a first seed layer over the wiring structure and in the hole;
thinning the substrate from a second surface of the substrate until the first seed layer in the hole is exposed, wherein the second surface is opposite to the first surface, and the hole penetrates through the substrate after thinning the substrate; and
forming a second seed layer over the second surface of the substrate and the first seed layer in the hole, wherein the hole has a first shape in a top view of the chip structure, the hole has a second shape in a bottom view of the chip structure, and the first shape is different from the second shape.