  SiPM-based readouts are becoming the standard for light detection in particle
detectors given their superior resolution and ease of use with respect to
vacuum tube photo-multipliers. However, the contributions of detection noise
such as the dark rate, cross-talk, and after-pulsing may impact significantly
their performance. In this work, we present the development of highly
reflective single-phase argon chambers capable of light yields up to 32
photo-electrons per keV, with roughly 12 being primary photo-electrons
generated by the argon scintillation, while the rest are accounted by optical
cross-talk. Furthermore, the presence of compound processes results in a
generalized Fano factor larger than 2 already at an over-voltage of 5 V.
Finally, we present a parametrization of the optical cross-talk for the FBK
NUV-HD-Cryo SiPMs at 87 K that can be extended to future detectors with
tailored optical simulations.
