Method of manufacturing semiconductor device, and semiconductor device
View Patent ↗A semiconductor device includes a semiconductor substrate provided with a through-hole, a device layer including a lower layer wiring, an insulating layer that covers the device layer, a first through-electrode that passes through the insulating layer, a first insulating film provided with an opening having a diameter that is substantially the same as or greater than an opening diameter of the through-hole of the semiconductor substrate, a second insulating film positioned on an upper side of the first insulating film and on an inner side surface of the through-hole of the semiconductor substrate, and a second through-electrode electrically connected to the lower layer wiring in the device layer from an upper side of the second insulating film through the inside of the through-hole of the semiconductor substrate.
1. A semiconductor device, comprising:
a semiconductor substrate provided with a through-hole extending through the semiconductor substrate from a first surface to a second opposed surface of the substrate;
a device layer, including a wiring, located on the first surface of the semiconductor substrate;
an insulating layer covering the device layer;
a first through-electrode extending through the insulating layer;
a first insulating film located on the second surface of the semiconductor substrate, including an opening having an opening diameter that is substantially the same as or greater than an opening diameter of the through-hole of the semiconductor substrate;
a second insulating film located on the first insulating film and on an inner side surface of the through-hole of the semiconductor substrate; and
a second through-electrode electrically connected to the wiring in the device layer from an upper side of the second insulating film through the inside of the through-hole of the semiconductor substrate.
2. The semiconductor device according to claim 1 , wherein the through hole has a first portion extending from the device layer in the direction of the second surface; and
a second portion located between the first portion and the second surface of the semiconductor substrate, wherein the second portion has a larger diameter than the diameter of the first portion.
3. The semiconductor device according to claim 2 , wherein the opening diameter of the first insulating film is substantially the same as or greater than the diameter of the second portion.
4. The semiconductor device according to claim 2 , wherein the opening diameter of the first insulating film is greater than the diameter of the through hole at the device layer.
5. The semiconductor device according to claim 2 , wherein the second through-electrode is exposed at the second surface of the semiconductor substrate, and a joining layer is located on the exposed surface of the second through electrode.
6. The semiconductor device of claim 1 , wherein the second through electrode overlies a portion of the first insulating film.
7. The semiconductor device according to claim 6 , further comprising a seed layer interposed between the second through electrode and the second insulating film, and overlying at least a portion of the first overlying film.