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Spectral QE of K2CsSb photocathodes through graphene coating QE through graphene coating 2 layers graphene 0.6 3 layers graphene 17μm 0.4 hv 0.2. 7.5 μm Quantum efficiency (%) 20 20 15 10 50 QE without graphene coating 2 layers graphene 3 layers graphene hv e 1 17μm Quantum efficiency (%) 0.0 Los Alamos NATIONAL LABORATORY 3 T 4 Photon energy (eV) LO 5 2 3 4 7.5 μm 5 Photon enregy eV Submitted 11/8/2021 10

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