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  4. Cryogenic Performance of Single-Photon Avalanche Diodes for Neutrino Detection
 
conference paper

Cryogenic Performance of Single-Photon Avalanche Diodes for Neutrino Detection

Ha, W.  
•
Gramuglia, F.
•
Toh, E.H.
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November 1, 2025
2025 IEEE Nuclear Science Symposium (NSS), Medical Imaging Conference (MIC) and Room Temperature Semiconductor Detector Conference (RTSD)
2025 IEEE Nuclear Science Symposium (NSS), Medical Imaging Conference (MIC) and Room Temperature Semiconductor Detector Conference (RTSD)

CMOS single-photon avalanche diodes (SPADs) are regarded as highly promising photodetectors for studying neutrino interactions with liquid argon at cryogenic temperatures (CT). This paper shows the performance of CMOS-SPADs using GlobalFoundries 55 nm BCDLite technology at CT. SPADs with deep junctions were tested to determine their performance. We measured I-V characteristics, dark count rate (DCR), photon detection probability (PDP), and breakdown voltage at various temperatures ranging from CT to room temperature (RT). Measurements were conducted using a cryogenic probe station capable of reaching 4 K. The study explored the effects of CT on breakdown voltage and PDP, as well as the impact of tunneling and trap-assisted thermal generation noise on DCR. These findings offer new insights into SPAD performance at CT, supporting advancements in quantum sensing, high-energy physics, and low-temperature photon detection.

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