Status of the FBK SiPM production for the Far Detector of DUNE

The Far Detector (FD) of the Deep Underground Neutrino Experiment (DUNE) will feature a Liquid Argon Time Projection Chamber (LArTPC) in which the scintillation light will be detected by Silicon Photomultipliers suited for cryogenic applications. Driven by the requirements of the DarkSide experiment, FBK has developed a SiPM technology for cryogenic applications (NUV-HD-Cryo SiPM) featuring a very low dark noise in the order of few mHz/mm2 at cryogenic temperature, low afterpulsing probability and a limited variation of the quenching resistance with temperature. In the framework of the DUNE collaboration, the NUV-HD-Cryo technology was further developed to obtain a device with high gain but limited crosstalk by increasing the number of Deep Trench Isolation (DTI) with the goal to have better Signal to Noise ratio for the DUNE readout module. Big physics experiments usually require devices with the highest performance possible, with low to medium production volumes in a short time to fulfill the tight schedule of the experiments. In FBK we developed a small supply chain, which comprises an external foundry for the SiPM fabrication with FBK technology and an external packaging company, capable of delivering up to moderate volumes of production of silicon detectors in a package. In this work,the NUV-HD-Cryo technology performance and the status of the FBK SiPM production for the DUNE experiment will be reported in terms of uniformity of the breakdown voltage, dark current and forward resistance of the SiPMs and quality assessment of the SiPM board packaging.