Charge accumulation and multiplication photodetector

Liang-Fu Lou; Kerry S. Kitazaki

doi:10.1117/12.158567

15 October 1993 Charge accumulation and multiplication photodetector

Liang-Fu Lou, Kerry S. Kitazaki

Proceedings Volume 2022, Photodetectors and Power Meters; (1993) https://doi.org/10.1117/12.158567
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

A charge-accumulation-and-multiplication photodetector (CHAMP) has been developed. The unit cell contains three coupled MOS capacitors designated as detector, transfer, and avalanche gates. The photocurrent at the detector gate is first integrated with the transfer gate closed and the avalanche gate ramping toward avalanche voltages. The charge is then transferred to the avalanche gate where charge multiplication occurs. These processes induce a displacement current pulse for readout which is proportional to the photocurrent, the integration time, and the multiplication gain factor, and is inversely proportional to the transfer time. A tunable current gain capable of exceeding the avalanche gain is achieved. A cooled CHAMP device is suitable for detecting photons of extremely low flux. The internal current gain and noise issues will be discussed.

Citation Download Citation

Liang-Fu Lou and Kerry S. Kitazaki "Charge accumulation and multiplication photodetector", Proc. SPIE 2022, Photodetectors and Power Meters, (15 October 1993); https://doi.org/10.1117/12.158567

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