Patent ID: 11869916
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method, comprising:
receiving a semiconductor substrate having a first side and a second side;
forming a radiation sensor in the semiconductor substrate;
forming an interconnect structure on the first side of the semiconductor substrate;
bonding a carrier substrate to the interconnect structure such that the interconnect structure is sandwiched between the carrier substrate and the first side of the semiconductor substrate;
forming a bond pad recess in the semiconductor substrate;
forming a conductive bond pad in the bond pad recess, wherein the conductive bond pad is coupled to the radiation sensor through a conductive feature in the interconnect structure;
forming a base oxide structure over the conductive bond pad, the base oxide structure including: a base portion extending directly over an upper surface of the conductive bond pad, and a collar portion at an outer edge of the base portion of the base oxide structure, the collar portion of the base oxide structure extending upwardly along an inner sidewall of the semiconductor substrate;
forming a nitride structure over the base oxide structure, the nitride structure including a base portion extending directly over an upper surface of the base portion of the base oxide structure and including a collar portion at an outer edge of the base portion of the nitride structure, the collar portion of the nitride structure lining inner sidewalls of the collar portion of the base oxide structure; and
forming a capping oxide structure over the nitride structure, the capping oxide structure disposed directly over an upper surface of the base portion of the nitride structure and lining inner sidewalls of the collar portion of the nitride structure.