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

Claim 6:
7. A method of forming an integrated chip, comprising:
forming an image sensor within a substrate;
forming a mask on the substrate, wherein the mask 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 one or more etching processes to selectively etch the substrate according to the mask to form a plurality of central diffusers and a plurality of peripheral diffusers, the plurality of peripheral diffusers laterally surrounding the plurality of central diffusers; and
wherein the plurality of central diffusers respectively comprise a square pyramidal shaped recess formed by four angled sidewalls, two of the four angled sidewalls intersecting an angled sidewall forming a neighboring one of the plurality of central diffusers and another two of the four angled sidewalls being directly coupled to a substantially flat surface that separates the plurality of central diffusers from the plurality of peripheral diffusers.