Patent ID: 11894319
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method comprising:
forming a first trench in an upper surface of a first workpiece, the first trench exposing a first seal ring of the first workpiece;
depositing a first conductive material in the first trench to form a first seal ring extension, the first seal ring extension extending continuously from a first interface with the first seal ring to an upper surface of the first workpiece;
forming a second trench in an upper surface of a second workpiece, the second trench exposing a second seal ring of the second workpiece;
depositing a second conductive material in the second trench to form a second seal ring extension, the second seal ring extension extending continuously from a second interface with the first seal ring to an upper surface of the second workpiece;
bonding the first workpiece to the second workpiece and the first seal ring extension to the second seal ring extension to form a third interface between the first seal ring extension and the second seal ring extension and to form an air gap between the first workpiece and the second workpiece, the air gap extending horizontally between an upper surface of the first workpiece and an upper surface of the second workpiece, the air gap sealed by the third interface; and
singulating a first package from the first workpiece and the second workpiece.