Metal shielding layer in backside illumination image sensor chips and methods for forming the same
First Claim
Patent Images
1. A device comprising:
- a semiconductor substrate having a front side and a backside;
a first photo-sensitive device at a surface of the semiconductor substrate, wherein the first photo-sensitive device is configured to receive a light signal from the backside of the semiconductor substrate and convert the light signal to an electrical signal;
an adhesion layer on the backside of the semiconductor substrate, the adhesion layer comprising an amorphous region and grains, substantially all grains in the adhesion layer having sizes smaller than about 50 Å
, wherein the adhesion layer comprises a compound of nitrogen and a metal; and
a metal shielding layer on the backside of the semiconductor substrate and contacting the adhesion layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A device includes a semiconductor substrate having a front side and a backside. A photo-sensitive device is disposed at a surface of the semiconductor substrate, wherein the photo-sensitive device is configured to receive a light signal from the backside of the semiconductor substrate, and convert the light signal to an electrical signal. An amorphous-like adhesion layer is disposed on the backside of the semiconductor substrate. The amorphous-like adhesion layer includes a compound of nitrogen and a metal. A metal shielding layer is disposed on the backside of the semiconductor substrate and contacting the amorphous-like adhesion layer.
-
Citations
20 Claims
-
1. A device comprising:
-
a semiconductor substrate having a front side and a backside; a first photo-sensitive device at a surface of the semiconductor substrate, wherein the first photo-sensitive device is configured to receive a light signal from the backside of the semiconductor substrate and convert the light signal to an electrical signal; an adhesion layer on the backside of the semiconductor substrate, the adhesion layer comprising an amorphous region and grains, substantially all grains in the adhesion layer having sizes smaller than about 50 Å
, wherein the adhesion layer comprises a compound of nitrogen and a metal; anda metal shielding layer on the backside of the semiconductor substrate and contacting the adhesion layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A device comprising:
-
a semiconductor substrate comprising a front surface and a back surface, wherein the back surface is over the front surface; a first photo-sensitive device and a second photo-sensitive device at the front surface of the semiconductor substrate; a dielectric layer over the back surface of the semiconductor substrate; a first anti-reflective coating layer over the dielectric layer; an adhesion layer over the first anti-reflective coating layer, wherein the adhesion layer comprises a compound of nitrogen and a metal; a metal shielding layer over and contacting the adhesion layer, wherein the metal shielding layer is over and aligned to the first photo-sensitive device, and wherein the metal shielding layer does not extend to over the second photo-sensitive device; and a passivation layer comprising a first portion over and aligned to the metal shielding layer, a second portion on a sidewall of the metal shielding layer, and a third portion over and aligned to the second photo-sensitive device, wherein the passivation layer is configured to act as a second anti-reflective coating layer, and wherein the device has a gray level uniformity of less than 7%, the gray level uniformity being measured by a ratio of a difference between a gray level at an edge of the semiconductor substrate and a gray level at a center of the semiconductor substrate to the gray level at the center of the semiconductor substrate. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A device comprising:
-
a semiconductor substrate comprising a front surface and a back surface, wherein the back surface is over the front surface; a first photo-sensitive device and a second photo-sensitive device in the semiconductor substrate; a first dielectric layer over the back surface of the semiconductor substrate; a first anti-reflective coating layer over the first dielectric layer; an adhesion layer over the first anti-reflective coating layer, wherein the adhesion layer comprises tantalum nitride, with an atomic percentage of nitrogen in the adhesion layer being higher than about 15 percent; a metal shielding layer over the adhesion layer, wherein the metal shielding layer is over and aligned to the first photo-sensitive device; a second dielectric layer comprising a first portion over and aligned to the metal shielding layer, a second portion on a sidewall of the metal shielding layer, and a third portion over and aligned to the second photo-sensitive device, wherein the second dielectric layer is configured to act as a second anti-reflective coating layer; and a black level calibration circuit, the device having a gray level uniformity of less than 7%. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification