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arXiv · 2411.09592

Is the gain-voltage dependence of SiPMs linear?

M. Antonello·L. Brinkmann·E. Garutti·R. Klanner·J. Schwandt
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Abstract

The gain-voltage dependence for SiPMs from V. Chmill et al., Study of the breakdown voltage of SiPMs, is reanalyzed and a non-linearity at the sub-percent level is observed. Simulations show that he non-linearity can be explained by the increase of the depletion depth of the avalanche region with over-voltage. A consequence of the non-linearity is that the voltage at which the discharge stops is systematically underestimated if a linear extrapolation is used. However, the shift is too small to explain the difference between the break-down voltage from the current-voltage dependence and the one obtained from the extrapolation of the gain-voltage dependence to gain one. The results are confirmed by measurement of a different MPPC produced by Hamamatsu which has a break-down voltage which is about a factor two higher.

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M. Antonello, L. Brinkmann, E. Garutti, R. Klanner, J. Schwandt. 2024-11-14. Is the gain-voltage dependence of SiPMs linear?. https://arxiv.org/abs/2411.09592

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