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

Claim 10:
11. A method of forming an integrated chip, comprising:
forming an image sensor within a substrate;
forming a mask on the substrate; and
selectively etching a back-side of the substrate according to the mask to form a plurality of central tapered cavities laterally surrounded by a plurality of peripheral tapered cavities, wherein the plurality of central tapered cavities have a larger size than respective ones of the plurality of peripheral tapered cavities;
wherein neighboring ones of the plurality of central tapered cavities are formed by angled sidewalls that intersect one another; and
wherein neighboring ones of the plurality of peripheral tapered cavities are separated from one another by a flat surface that continuously extends from directly between the neighboring ones of the plurality of peripheral tapered cavities along a first direction to directly between the plurality of peripheral tapered cavities and the plurality of central tapered cavities along a second direction, the first direction being perpendicular to the second direction in a top-view.