SMuK 2023 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Physics and Technology for Radiation Detection
ST 5.6: Vortrag
Mittwoch, 22. März 2023, 17:05–17:20, ZEU/0146
A novel silicon photomultiplier in 350 nm CMOS technology with virtual guard rings and improved geometric efficiency — •Jonathan Preitnacher1, Wolfgang Schmailzl1, Sergei Ageev2, and Walter Hansch1 — 1Bundeswehr University Munich, Neubiberg, Germany — 2The Moscow Engineering Physics Institute-Kashira Hwy, 31, Moscow, Russland, 115409
Silicon photomultipliers (SiPM) are solid-state detectors that can resolve single photons and that are used in various applications like high energy physics or the fields of medical imaging. The implementation of virtual guards is an established technique in full costume SiPM designs to increase the geometric efficiency and therefore the photon detection efficiency (PDE). We present a novel approach applying virtual guard rings in a standard CMOS 350 nm process, improving the geometric efficiency by up to 45% compared to a guard ring design of the same process. We compare both approaches, presenting PDE measurements and additional characteristics of the devices like the breakdown voltage or the dark count rate. In a third design, we coupled the SiPM on the same chip to a costume low-power integrated amplifier to improve the pulse height and the slew rate. Measurements are presented to compare the photon time resolution of the SiPM designs with and without the amplifier.