Patent ID: 11869991
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 11:
12. A method for forming a semiconductor device, comprising:
forming a semiconductor layer over a first dielectric layer;
patterning the semiconductor layer to form a patterned semiconductor layer comprising a waveguide, wherein the waveguide comprises:
a first portion having a first width; and
a second portion having a second width larger than the first width, wherein the second portion of the waveguide is between a first portion of the patterned semiconductor layer and a second portion of the patterned semiconductor layer;

forming a patterned photoresist over the patterned semiconductor layer, wherein the patterned photoresist defines an opening exposing the first portion of the patterned semiconductor layer;
doping the first portion of the patterned semiconductor layer through the opening to form an n-doped semiconductor structure adjacent the second portion of the waveguide; and
doping the second portion of the patterned semiconductor layer to form a p-doped semiconductor structure adjacent the second portion of the waveguide.