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EFFECTIVE PHOTOSENSITIVE SURFACE OF SILICON PHOTOMULTIPLIERS

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Research has been carried out to determine the effective area of the photosensitive surface of silicon photomultipliers (SiPM) at the operating supply voltage, as well as to establish the dependence of this characteristic on the applied supply voltage. Silicon photomultipliers KOF5-1035 (Belarus), Ketek RM 3325 and ON Semi FC 30035 (Germany) are selected for the study. Application of developed experimental setup makes it possible to reveal that an increase in the supply voltage leads to an increase in the area of the effective photosensitive surface of the SiPM. It is found that the maximum value of sensitivity at a given operating voltage is observed in the central part of the photosensitive surface and decreases symmetrically as the spot of the optical probe approaches the surface edge. The results obtained can be used to create devices for detecting optical radiation in the visible range based on silicon photomultipliers.

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