Characterization of SiPMs for the photon detection system of the DUNE far detector

The Deep Underground Neutrino Experiment (DUNE) is a next generation experiment with the purpose of studying neutrino oscillation. It will contribute in solving some still open questions as a neutrino mass ordering and a possible CP violation in the leptonic sector. The experiment will be implemented with a Near Detector (ND) and a Far Detector (FD), placed at a distance of ~1300 km. The FD complex will be composed of four detectors modules of Liquid Argon Time Projection Chambers. In order to detect the scintillation light emitted by neutrino interactions inside the detector, the FD will make use of a Photon Detection system formed by light collectors coupled to Silicon Photomultipliers (SiPMs). This thesis is focused on the test activities carried out to verify the compatibility of the photosensors to the experiment requirements necessary to ensure a uniform response of the system. A full characterization of the first SiPM sample is presented, studying their behaviour both at room and in cryogenic environment (77 K).