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Proceedings Paper

Characterization of Al0.8Ga0.2As Geiger photodiodes
Author(s): X. J. Chen; Min Ren; Yaojia Chen; E. B. Johnson; Joe C. Campbell; James F. Christian
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Paper Abstract

Solid-state photomultipliers (SSPM) are high gain photodetectors composed of Geiger photodiodes (GPD) operating above device breakdown voltage. In scintillation based radiation detection applications, SSPMs fabricated using silicon (SiPMs, MPPCs, etc) provide a compact, low cost alternative to photomultiplier tubes (PMTs), however, the high dark count rate due to its low band-gap (1.1eV) limits the signal-to-noise performance as the silicon SSPM is scaled to large areas. SSPMs fabricated in materials with a larger band-gap have the potential to surmount the performance limitations experienced by silicon. AlGaAs is a material that provides a bandgap from 1.55eV to 2.13 eV, depending on Al concentration. Using high Al concentration AlGaAs to engineer a wideband- gap (>2eV) SSPM is very desirable in terms of reducing dark noise, which promises better signal-to-noise performances when large detector areas is needed. This work describes the development of Geiger photodiodes (GPDs), the individual elements of a SSPM, fabricated in AlGaAs with 80% Al concentration. We present the design of the GPDs, the fabrication process, along with characterization data of fabricated GPD samples. To the best of our knowledge, we have demonstrated for the first time, a passively quenched Geiger photodiode in Al0.8Ga0.2As.

Paper Details

Date Published: 24 August 2015
PDF: 11 pages
Proc. SPIE 9601, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX, 96010W (24 August 2015); doi: 10.1117/12.2188473
Show Author Affiliations
X. J. Chen, Radiation Monitoring Devices, Inc. (United States)
Min Ren, Univ. of Virginia (United States)
Yaojia Chen, Univ. of Virginia (United States)
E. B. Johnson, Radiation Monitoring Devices, Inc. (United States)
Joe C. Campbell, Univ. of Virginia (United States)
James F. Christian, Radiation Monitoring Devices, Inc. (United States)

Published in SPIE Proceedings Vol. 9601:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX
Oswald H. Siegmund, Editor(s)

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