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Electronic cooling in hybrid normal metal-insulator-superconductor junctionsis a promising technology for the manipulation of thermal loads in solid statenanosystems. One of the main bottlenecks for efficient electronic cooling isthe electron-phonon coupling, as it represents a thermal leakage channel to thephonon bath. Graphene is a two-dimensional material that exhibits a weakerelectron-phonon coupling compared to standard metals. For this reason, we studythe electron cooling in graphene-based systems consisting of a graphene sheetcontacted by two insulator/superconductor junctions. We show that, by properlybiasing the graphene, its electronic temperature can reach base values lowerthan those achieved in similar systems based on metallic ultra-thin films.Moreover, the lower electron-phonon coupling is mirrored in a lower heat powerpumped into the superconducting leads, thus avoiding their overheating andpreserving the cooling mechanisms. Finally, we analyze the possible applicationof cooled graphene as a bolometric radiation sensor. We study its main figuresof merit, i.e. responsivity, noise equivalent power and response time. Inparticular, we show that the built-in electron refrigeration allows reaching aresponsivity of the order of 50 nA/pW and a noise equivalent power of order of$\rm 10^{-18}\, W\, Hz^{-1/2}$ while the response speed is about 10 ns,corresponding to a thermal bandwidth in the order of 20MHz.

Electron cooling with graphene-insulator-superconductor tunnel junctions and applications to fast bolometry