February 11, 2017 Preprint Open Access

Pancheri, L.; et al.

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    "description": "<p>In this paper, we present the implementation and preliminary evaluation of a new type of silicon sensor for charged particle detection operated in Geiger-mode. The proposed device, formed by two vertically-aligned pixel arrays, exploits the coincidence between two simultaneous avalanche events to discriminate between particle-triggered detections and dark counts. A proof-of-concept two-layer sensor with per-pixel coincidence circuits was designed and fabricated in a 150 nm CMOS process and vertically integrated through bump bonding. The sensor includes a 48\u00d716 pixel array with 50 \u03bcm X 75 \u03bcm pixels. This work describes the sensor architecture and reports a selection of results from the characterization of the avalanche detectors in the two layers. Detectors with an active area of 43 X 45\u03bcm\u00b2 have a median dark count rate of 3 kHz at 3.3 V excess bias and a breakdown voltage non-uniformity lower than 20 mV.</p>", 
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    "title": "First prototypes of two-tier avalanche pixel sensors for particle detection"
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