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Studies on multiplication effect of noises of PPD, and a proposal of a new structure to improve the performance

✍ Scribed by H. Oide; T. Murase; H. Otono; S. Yamashita

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
187 KB
Volume
623
Category
Article
ISSN
0168-9002

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✦ Synopsis

Pixelated photon detectors (PPDs) are arrayed APDs operated in Geiger-mode. Multi-pixel photon counter (MPPC) is a PPD produced by Hamamatsu Photonics K.K. We performed measurement of total noise rate, random noise rate, after-pulsing, crosstalk, and relative photon detection efficiency for a 1600 px MPPC. The explosive increase of total noise rate to over-voltage is able to be understood of multiplication effect of after-pulsing and crosstalk. Considering the electric field structure of MPPC (p-on-n type) and Geiger-efficiency as a function of the position of initial pair creation, these characteristics are all able to be understood. One suggestion for p-on-n type PPD from these results is narrowing the depletion layer below the multiplication layer to reduce random noise and after-pulsing. Another proposal is to put additional buffer capacitance parallel to the diode to accomplish higher gain with lower over-voltage simultaneously with lower noise rate.

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