Patent ID: 11923392
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming an integrated chip, comprising:
forming an image sensing element within a pixel region of a substrate;
forming a plurality of interconnect layers within a dielectric structure along a front-side of the substrate;
forming a masking layer along a back-side of the substrate, wherein the masking layer comprises a first opening having a first width and a plurality of second openings having one or more second widths that are respectively smaller than the first width;
performing an etching process to selectively etch the back-side of the substrate according to the masking layer to define a central diffuser laterally surrounded on opposing sides by a plurality of peripheral diffusers, wherein the back-side of the substrate comprises a substantially flat surface laterally extending between peripheries of the central diffuser and an adjacent one of the plurality of peripheral diffusers;
wherein the central diffuser has a greater width and depth than respective ones of the plurality of peripheral diffusers; and
wherein a first pair of the plurality of peripheral diffusers is arranged on opposing sides of the central diffuser and along a first line that bisects the central diffuser in a top-view of the central diffuser, and a second pair of the plurality of peripheral diffusers is arranged on opposing sides of the central diffuser and along a second line, the second line being perpendicular to the first line and bisecting the central diffuser in the top-view of the central diffuser.