Speaker
Description
We present a detailed investigation of the afterpulse effect in silicon photomultipliers (SiPMs), using a dedicated structure with single-cell readout, which enables direct measurement of intrinsic device properties and observation of individual pulses also after irradiation.
Three independent analysis methods to quantify afterpulse induced events were developed and validated by Monte Carlo simulations.
The first method is based on charge integration, while the other two methods use multiple linear regression to reconstruct transient waveforms and accurately identify individual pulse positions. These pulse positions are then used either as direct event counts or to construct time interval distributions, enabling comprehensive characterization of the afterpulse probability and providing insights into the dynamics of trapping in silicon.
Using this framework, we measured three SiPM samples with single-cell readout: one fresh reference device and two irradiated devices that were exposed to neutron fluences of 2x1012 and 1x1013 neq/cm2.
We report systematic measurements of the afterpulse probability and time constant as functions of bias voltage and irradiation fluence. For overvoltages in the range of 3–5 V above breakdown, the afterpulse time constant is found to be below 10 ns and the afterpulse probability below 5%. Both quantities show no significant dependence on irradiation fluence.
| Speaker Confirmation | Yes |
|---|