Abstract

High-gain and high-speed photodetectors with wide dynamic range are essential to photon counting applications. In this work, a novel design of a spherical silicon detector (SSD) based on a photodiode (PD)-body-biased MOSFET was proposed. It uses a silicon sphere as substrate and vertically integrates a PD with a body-biased MOSFET. An analytical model demonstrates its photocurrent and gain in the sub-threshold region increases exponentially with the illuminated photon flux. Further study suggests its gain can exceed ~106 and time resolution can reach ~1ns. With an estimated dynamic range of ~160dB, the proposed SSD has a great potential in photon counting applications including 3-D depth camera, positron emission computed tomography (PET), super-resolution imaging and LiDAR.

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