Patent ID: 11894401
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A method for forming an image sensor, the method comprising:
forming a shallow trench isolation (STI) structure on a front-side surface of a semiconductor substrate;
forming a first photodetector and a second photodetector in the semiconductor substrate, wherein the first and second photodetectors are laterally separated by the STI structure;
forming a readout transistor on the front-side surface, wherein a first sidewall of the readout transistor overlies the first photodetector and a second sidewall of the readout transistor overlies the second photodetector, wherein the first sidewall is opposite the second sidewall, and wherein the readout transistor continuously extends over an upper surface of the STI structure;
forming first source/drain regions along the first sidewall of the readout transistor;
forming a first junction isolation structure along the first sidewall of the readout transistor, wherein the first junction isolation structure is laterally between the first source/drain regions; and
forming a deep-trench isolation (DTI) structure on a back-side surface of the semiconductor substrate, wherein the DTI structure extends from the back-side surface to the STI structure.