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

Claim 9:
10. A method comprising:
forming a trench extending into a substrate;
depositing a first semiconductor layer comprising portions extending into the trench, wherein the first semiconductor layer comprises a first horizontal portion;
performing a first anisotropic treatment process to form a first passivation layer on the first semiconductor layer, wherein the first anisotropic treatment process converts a top portion of the first semiconductor layer into the first passivation layer; depositing a second semiconductor layer on the first passivation layer, wherein the first semiconductor layer and the second semiconductor layer comprise different semiconductor materials; and
performing a second anisotropic treatment process to form a second passivation layer on the second semiconductor layer.