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In the 1990s, a novel semiconductor photon-sensor operated in Geiger-mode wasinvented in Russia (Silicon PhotoMultiplier), which consists of many tinypixels and has a single photon level sensitivity. Since then, various types ofthe sensor with this scheme, Pixelized Photon Detectors (PPD), have beendeveloped in many places in the world. For instance, Hamamatsu Photonics K.K.in Japan produces the PPD as a Multi-Pixel Photon Counter. While the internalmechanisms of the PPD have been intensively studied in recent years, theexisting models do not succeeded to fully reproduce the output characteristic,such as waveforms at low temperature. We have developed a new model with thetransient multiplication and quenching of the realistic avalanche process andhave succeeded in reproducing the output waveform of the PPD at varioustemperature. In this paper, we discuss our improved model.

Study of the internal mechanisms of Pixelized Photon Detectors operated in Geiger-mode