Product Code: ICA12_M1105

1.3µM-Band Si Photodetectors with Optical Gains Fabricated by Dressed Photon Assisted Annealing
Authors:
Hajime Tanaka, Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The Univ. of Tokyo; Tokyo Japan
Tadashi Kawazoe, Department of Electrical Engineering and Information Systems, Nanophotonics Research Center, Graduate School of Engineering, The Univ. of Tokyo; Tokyo Japan
Motoichi Ohtsu, Department of Electrical Engineering and Information Systems, Nanophotonics Research Center, Graduate School of Engineering, The Univ. of Tokyo; Tokyo Japan
Presented at ICALEO 2012

We fabricated a novel photodetector by subjecting a Si crystal having a pn homojunction to phonon-assisted annealing. The photosensitivity of this device for incident light having a wavelength of 1.16 μm or greater was about three-times higher than that of a reference Si-PIN photodiode. The photosensitivity for incident light with a wavelength of around 1.32 μm was increased by applying a forward current. When the forward current density was 10 A/cm2, the device showed photosensitivities of 3.1 A/W at a wavelength of 1.14 μm and 0.10 A/W at 1.32 μm. The photosensitivity at 1.32 μm is at least 4000-times higher than the zero-bias photosensitivity. This remarkable increase was due to the manifestation of optical amplification cause by the forward current injection. For a forward current density of 9 A/cm2, the small-signal gain coefficient of the optical amplification was 2.2 102, and the saturation power was 7.1 102 mW.