In this work we present the full characterization of new RGB-HD SiPM prototypes. This technology is characterized by a very narrow cell border region and by trenches for electrical isolation and optical attenuation. We produced a set of devices with cell sizes of 12x12, 15x15, 20x20, 25x25 and 30x30 um2 having a very high fill factor. For the smallest cell, we measured a photo-detection efficiency close to 30 % around the green region of the light spectrum whereas for the larger ones it reached 50%. Setting a limit of 10 % to the optical cross-talk, the PDE reaches a remarkable value of 40% in the last three structures. We coupled 4x4 mm2 SiPMs to a 3x3x5 mm3 CsI(Tl) scintillator and we measured an energy resolution at 122 keV of 10 % FWHM using the 20x20 um2 cell size. We also measured the performance of the same devices coupled to 3x3x5 mm3 LYSO crystal at 511 keV. For both the 20x20 um2 and 25x25 um2 cell sizes, the energy resolution is better than 10 % FWHM and the coincidence resolving time is close to 140 ps FWHM at 20C.

New Developments on High Dynamic Range SiPM Technology

Piemonte, Claudio;Acerbi, Fabio;Ferri, Alessandro;Gola, Alberto Giacomo;Paternoster, Giovanni;Picciotto, Antonino;Zorzi, Nicola
2014

Abstract

In this work we present the full characterization of new RGB-HD SiPM prototypes. This technology is characterized by a very narrow cell border region and by trenches for electrical isolation and optical attenuation. We produced a set of devices with cell sizes of 12x12, 15x15, 20x20, 25x25 and 30x30 um2 having a very high fill factor. For the smallest cell, we measured a photo-detection efficiency close to 30 % around the green region of the light spectrum whereas for the larger ones it reached 50%. Setting a limit of 10 % to the optical cross-talk, the PDE reaches a remarkable value of 40% in the last three structures. We coupled 4x4 mm2 SiPMs to a 3x3x5 mm3 CsI(Tl) scintillator and we measured an energy resolution at 122 keV of 10 % FWHM using the 20x20 um2 cell size. We also measured the performance of the same devices coupled to 3x3x5 mm3 LYSO crystal at 511 keV. For both the 20x20 um2 and 25x25 um2 cell sizes, the energy resolution is better than 10 % FWHM and the coincidence resolving time is close to 140 ps FWHM at 20C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11582/261425
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