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Marsili, F. (author), Najafi, F. (author), Herder, C. (author), Berggren, K.K. (author)We developed an electrothermal model of NbN superconducting nanowire avalanche photodetectors (SNAPs) on sapphire substrates. SNAPs are single-photon detectors consisting of the parallel connection of N superconducting nanowires. We extrapolated the physical constants of the model from experimental data and we simulated the time evolution of the...journal article 2011