Patent ID: 11862650
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image sensor, comprising:
a photodetector disposed in a semiconductor substrate;
a light filter grid structure disposed over a back-side of the semiconductor substrate, the back-side of the semiconductor substrate opposite a front-side of the semiconductor substrate, wherein a metallization structure is disposed on the front-side of the semiconductor substrate;
a light filter disposed in the light filter grid structure;
a dielectric layer disposed over the back-side of the semiconductor substrate and between the photodetector and the light filter;
a metal grid disposed in the dielectric layer, wherein the metal grid comprises a first portion disposed on a first side of the photodetector and a second portion disposed on a second side of the photodetector opposite the first side of the photodetector; and
a noise reducing structure disposed vertically between the light filter and the back-side of the semiconductor substrate, wherein the noise reducing structure is disposed laterally between the first portion of the metal grid and the second portion of the metal grid;
wherein the dielectric layer has a base portion extending laterally over an upper surface of the photodetector and between a lower portion of the first portion of the metal grid and a lower portion of the second portion of the metal grid, and wherein the dielectric layer has an upper portion extending upwardly along sidewalls of the first portion and second portion of the metal grid.