Patent ID: 7843030
Filing Date: 2010-11-30
Classification: H01L

Abstract:
1. A photo detector transistor formed of a semiconductor, the transistor comprising: a substrate layer; a collector layer of the semiconductor formed on the substrate layering having a first conductivity type; an intermediate layer of one or more layers of the semiconductor having a second conductivity type formed on the collector layer; an emitter layer of the semiconductor of the first conductivity type formed on the intermediate layer of the second conductivity type; wherein the one or more layers includes an absorption layer of the second conductivity type having low doping configured to absorb photons of a particular wavelength and the collector layer and the emitter layer of the first conductivity type are highly doped and the doping of the absorption layer is lower than the doping of the collector layer and the emitter layer is fully depleted and a wavelength of photons absorbed by the transistor corresponds to the semiconductor.