Patent ID: 9362428
Filing Date: 2016-06-07
CPC Classification: H01L

Claim Text:
1. A silicon-based germanium photodetector device comprising: a first reflective region; a second reflective region; and a light absorption region positioned between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions, wherein the first reflective region is such constructed that a reflectivity of the first reflective region is substantially equal to a one-circulation attenuation coefficient of the light absorption region, wherein the first reflective region is responsible for causing a destructive interference upon light escaping from the first reflective region so as to reduce an amount of light that escapes from the first reflective region, wherein the second reflective region includes a combination of a dielectric layer and a metal coating, the dielectric layer (1) having at least one of: oxide, or nitride, and (2) being positioned closer to the light absorption region than the metal coating, wherein the combination causes a reflectivity of the second reflective region to exceed ninety percent (90%), and wherein the light absorption region includes germanium.