Patent ID: 7846837

Claim:
A through substrate via (TSV) process, comprising: providing a substrate, comprising a first side and a second side opposite to the first side; forming a plurality of holes in the substrate at the first side; forming a first dielectric layer on a sidewall and a bottom of the holes; forming a second dielectric layer in the holes, wherein a material of the second dielectric layer is different from a material of the first dielectric layer; forming a semiconductor device, a plurality of dielectric layers and an interconnect on the substrate at the first side, wherein the dielectric layers in which the interconnect are formed cover the semiconductor device; removing at least a portion of the substrate at the second side, so as to expose the second dielectric layer in the holes; removing the second dielectric layer; forming a conductive layer in the holes, wherein the dielectric layers and the interconnect are formed on the conductive layer and the substrate; and after forming the conductive layer in the holes, bonding the substrate to another substrate in a stacked manner, wherein the step of forming the semiconductor device, the dielectric layers and the interconnect on the substrate at the first side is performed before the step of removing at least the portion of the substrate at the second side, but after the step of forming the second dielectric layer in the holes.