Patent ID: 9698296
Date: 2017-07-04
CPC Classifications: H01L

Claim:
1. A photonic device, comprising: a silicon-based substrate; a first contact layer heavily doped with first-type dopants and disposed on the substrate; a multiplication layer disposed on the first contact layer; a charge layer doped with second-type dopants and disposed on the multiplication layer; a germanium (Ge) absorption layer disposed on the charge layer; a second contact layer heavily doped with the second-type dopants and disposed on the Ge absorption layer; and one or more anti-reflection layers disposed on the second contact layer, wherein a portion of the charge layer interfacing the Ge absorption layer and a portion of the Ge absorption layer interfacing the charge layer together form a compensation region, the compensation region doped with compensation dopants such that an effective carrier concentration caused by defect energy states is reduced and a second carrier concentration in a bulk region of the Ge absorption layer is reduced, wherein the charge layer is implanted with first-type dopants such that the compensation region is doped with the first-type dopants, wherein the first-type dopants comprise n-type dopants, wherein the second-type dopants comprise p-type dopants, and wherein the n-type dopants in the compensation region compensate p-type defect energy states.