Metal shielding layer in backside illumination image sensor chips and methods for forming the same
First Claim
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1. A method comprising:
- forming a first photo-sensitive device and a second photo-sensitive device at a front surface of a semiconductor substrate;
forming a dielectric layer over a back surface of the semiconductor substrate;
depositing an adhesion layer over the dielectric layer, wherein the adhesion layer comprises a compound of nitrogen and a metal, and wherein substantially all grains in the adhesion layer are smaller than about 50 Å
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forming a metal shielding layer over and contacting the adhesion layer, wherein the adhesion layer and the metal shielding layer are on a backside of the semiconductor substrate; and
patterning the adhesion layer and the metal shielding layer to remove a first portion of the adhesion layer and a first portion of the metal shielding layer, wherein a second portion of the adhesion layer and a second portion of the metal shielding layer remain over the dielectric layer after patterning the adhesion layer and the metal shielding layer.
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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.
37 Citations
20 Claims
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1. A method comprising:
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forming a first photo-sensitive device and a second photo-sensitive device at a front surface of a semiconductor substrate; forming a dielectric layer over a back surface of the semiconductor substrate; depositing an adhesion layer over the dielectric layer, wherein the adhesion layer comprises a compound of nitrogen and a metal, and wherein substantially all grains in the adhesion layer are smaller than about 50 Å
;forming a metal shielding layer over and contacting the adhesion layer, wherein the adhesion layer and the metal shielding layer are on a backside of the semiconductor substrate; and patterning the adhesion layer and the metal shielding layer to remove a first portion of the adhesion layer and a first portion of the metal shielding layer, wherein a second portion of the adhesion layer and a second portion of the metal shielding layer remain over the dielectric layer after patterning the adhesion layer and the metal shielding layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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providing a substrate comprising a first image sensor at a first surface; depositing an adhesion layer over a second surface of the substrate opposite the first surface, wherein depositing the adhesion layer comprises; using nitrogen and argon as process gases; and controlling a flow-rate ratio of a flow-rate of nitrogen to a combined flow-rate of nitrogen and argon to be greater than about 35 percent; depositing a metal shielding layer over the adhesion layer; and patterning the adhesion layer and the metal shielding layer to remove portions of the adhesion layer and the metal shielding layer disposed directly over the first image sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
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depositing a dielectric layer over a substrate, wherein the substrate comprises a first image sensor and a second image sensor at a surface opposing the dielectric layer; depositing a first buffer layer over the dielectric layer; depositing an adhesion layer over the first buffer layer, wherein depositing the adhesion layer comprises using argon and nitrogen as process gasses, and wherein a partial-pressure ratio of a partial pressure of nitrogen to a combined partial pressure of nitrogen and argon is greater than about 35 percent during depositing the adhesion layer; depositing a metal shielding layer over the adhesion layer; depositing a second buffer layer over the metal shielding layer; and patterning the first buffer layer, the adhesion layer, the metal shielding layer, and the second buffer layer to remove first portions of the first buffer layer, the adhesion layer, the metal shielding layer, and the second buffer layer aligned with the first image sensor while not removing second portions of the first buffer layer, the adhesion layer, the metal shielding layer, and the second buffer layer aligned with the second image sensor. - View Dependent Claims (18, 19, 20)
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Specification