Patent ID: 11942363
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A method comprising:
depositing a first semiconductor layer, wherein the first semiconductor layer comprises:
a first bottom portion at a bottom of a trench in a semiconductor substrate; and
a first sidewall portion on a sidewall of the semiconductor substrate, with the sidewall of the semiconductor substrate facing the trench;

passivating the first semiconductor layer to form a first dielectric layer on a first remaining portion of the first semiconductor layer;
depositing a second semiconductor layer over the first dielectric layer, wherein the first semiconductor layer and the second semiconductor layer are formed of different semiconductor materials; and
passivating the second semiconductor layer to form a second dielectric layer over a second remaining portion of the second semiconductor layer.