Patent ID: 11923466
Assignee: INNOLIGHT TECHNOLOGY (SUZHOU) LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 7:
8. A method for manufacturing a photodetector with an integrated reflective grating structure, comprising:
providing a substrate;
doping the substrate to form a first doped region and forming a grating structure above the first doped region, or, forming a grating structure on the substrate and doping the substrate below the grating structure to form a first doped region;
epitaxially growing a germanium layer as an active layer on the substrate with the grating structure formed on the substrate;
doping an upper portion of the epitaxially grown active layer to form a second doped region; and
forming a PIN structure from the active layer and the first and second doped regions, the first and second doped regions having different doping types,
wherein the grating structure is disposed on top of the first doped region and at the bottom of the active layer, and
a portion of the active layer is higher than the grating structure.