Granted Patent B2

US 12,419,129 · App. 18/771,052 · Granted Sep 16, 2025

Inventors: Taku Umebayashi (Kanagawa, JP); Hiroshi Takahashi (Kanagawa, JP); Reijiroh Shohji (Nagasaki, JP)

Assignee: Sont Group Corporation

H10F39/809H01L21/76898H01L23/481H04N23/00H04N25/76H04N25/79H10F39/018H10F39/026H10F39/18H10F39/182H10F39/199H10F39/8037H10F39/8053H10F39/8063H10F39/811H01L2224/11

Abstract

Claims (28)

1. A light detecting device, comprising:

a first section including a first wiring layer and a photodiode in a first semiconductor substrate, wherein the first wiring layer is on a side of the first section opposite to a light incident side of the first section;

a second section including a second wiring layer and a circuit in a second semiconductor substrate; and

an electrode pad that is electrically connected to a first wiring in the first wiring layer via a through electrode,

wherein the first section and the second section are bonded together such that the first wiring layer and the second wiring layer face one another,

wherein a second wiring included in the first wiring layer and a third wiring included in the second wiring layer are connected to each other,

wherein a first part of a first insulating interlayer of the first wiring layer and a first part of a second insulating interlayer of the second wiring layer are connected to each other,

wherein the first wiring is electrically connected to the photodiode, and

wherein the second wiring is electrically connected to the circuit.

2. The light detecting device according to claim 1 , wherein the second and third wirings are copper wirings.

3. The light detecting device according to claim 2 , wherein the first wiring is a copper wiring.

4. The light detecting device according to claim 3 , wherein the insulating interlayers of the first and second wiring layers are silicon dioxide films.

5. The light detecting device according to claim 1 , wherein the third wiring and the second wiring are in direct contact with one another.

6. The light detecting device according to claim 1 , wherein the second wiring is connected to the circuit by the third wiring.

7. The light detecting device according to claim 1 , wherein the electrode pad is on a light incident side of the first semiconductor substrate.

8. The light detecting device according to claim 7 , wherein the electrode pad includes an aluminum film.

9. The light detecting device according to claim 8 , wherein at least a portion of the through electrode penetrates the first wiring layer.

10. The light detecting device according to claim 7 , wherein at least a portion of the through electrode penetrates the first semiconductor substrate.

11. The light detecting device according to claim 7 , wherein the through electrode extends from the first wiring to the light incident side of the first semiconductor substrate.

12. The light detecting device according to claim 7 , wherein the through electrode extends between the light incident side of the first semiconductor substrate and a side of the first semiconductor substrate opposite to the light incident side of the first semiconductor substrate.

13. The light detecting device according to claim 7 , wherein an insulating layer separates the through electrode from the first semiconductor substrate.

14. The light detecting device according to claim 13 , wherein the insulating layer separates the through electrode from the first insulating interlayer.

15. The light detecting device according to claim 1 , wherein the first wiring is covered by a first barrier metal layer, and wherein the second wiring is covered by a second barrier metal layer.

16. The light detecting device according to claim 15 , wherein the first barrier metal layer and the second barrier metal layer include titanium (Ti).

17. The light detecting device according to claim 1 , further comprising a through-connection conductor, wherein the through electrode is electrically connected to the through-connection conductor by the electrode pad.

18. The light detecting device according to claim 1 , wherein the second wiring and a first surface of the first insulating interlayer partially form a first bonding surface of the first section, wherein the third wiring and a first surface of the second insulating interlayer partially form a second bonding surface of the second section, and wherein the first bonding surface is bonded to the second bonding surface.

19. The light detecting device according to claim 1 , further comprising a light-shielding layer formed on the light incident side of the first section.

20. The light detecting device according to claim 19 , wherein the light-shielding layer includes a metal.

Assignments (2)

Priority Claims (2)

Continuity (12)

References Cited (176)