Patent ID: 11949030
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method of forming an optoelectronic device, comprising:
providing a substrate;
forming a germanium photodiode region extending into an upper surface of the substrate, wherein the germanium photodiode region has a curved upper surface that extends past the upper surface of the substrate;
forming a silicon cap over the curved upper surface of the germanium photodiode region, wherein there is an absence of oxide between the curved upper surface of the germanium photodiode region and an upper surface of the silicon cap;
forming a p-type region to a first side of the germanium photodiode region and at a first location laterally beyond a first outer sidewall of an isolation structure furthest from the germanium photodiode region; and
forming an n-type region to a second side of the germanium photodiode region and at a second location laterally beyond a second outer sidewall of the isolation structure furthest from the germanium photodiode region; and
wherein the p-type region, the n-type region, and the germanium photodiode region establish a p-n photodiode or a p-i-n photodiode.