Patent ID: 11901388
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The method according to claim 1, wherein the forming of the readout transistor comprises:
depositing a first polysilicon layer covering the semiconductor mesa;
performing a second selective etch into the first polysilicon layer and the dielectric layer to form a first opening and a second opening respectively and partially exposing the first and second transfer transistors;
depositing a second polysilicon layer filling the first and second openings, wherein the second polysilicon layer defines a pair of vias in the first and second openings; and
performing a third selective etch into the first polysilicon layer to form a gate electrode of the readout transistor, wherein the gate electrode is electrically coupled to the first and second transfer transistors by the vias.