Patent ID: 9748429
Date: 2017-08-29
CPC Classifications: G02B,H01L,Y02E

Claim:
1. An avalanche photodiode device comprising: a silicon body having a planar upper surface and containing a multiplication region; a germanium body laterally offset from the silicon multiplication region, grown epitaxially on portions of the silicon upper surface, and containing an absorption region; a waveguide optically coupled to the germanium body with respect to light of at least one operating wavelength; and a dielectric spacer region interposed between the silicon body and a major portion of the germanium body; wherein the dielectric spacer region is formed with one or more aspect-ratio-trapping trenches extending vertically through the dielectric spacer region from the silicon body to the major portion of the germanium body; and the germanium body comprises said major portion and further comprises a dislocation-trapping portion consisting of epitaxial germanium filling each of said one or more aspect-ratio-trapping trenches.