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20 February 2017 A high-efficiency low-noise signal amplification mechanism for photodetectors
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Proceedings Volume 10108, Silicon Photonics XII; 101080X (2017)
Event: SPIE OPTO, 2017, San Francisco, California, United States
Recently we discovered a signal amplification mechanism to amplify photocurrent with high efficiency and low noise. Unlike conventional impact ionization used in avalanche photodetectors, the new amplification mechanism can produce high (>1000) gain with very low excess noise factor (<2 for Si) under very low bias voltage (3V). The new amplification mechanism offers a promising solution for light detection for Si-photonics, imaging, and sensing. Physics of this mechanism lies in two subsequent processes i) Auger excitation between mobile and highly localized electrons and ii) electron-phonon coupling. In this paper, experimental results are supported by the proposed physical model using simulations within density functional theory (DFT) framework.
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Mohammad Abu Raihan Miah, Iftikhar Ahmad Niaz, Yu-Hsin Liu, David Hall, and Yu-Hwa Lo "A high-efficiency low-noise signal amplification mechanism for photodetectors", Proc. SPIE 10108, Silicon Photonics XII, 101080X (20 February 2017);

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