Fig. 4 | npj 2D Materials and Applications

Fig. 4

From: Active bialkali photocathodes on free-standing graphene substrates

Fig. 4

QE spectral response based on photoemission from the PC and graphene (Gr) sides of the films. GrPC indicate photoemission measured in a Gr-in, PC-out configuration and GrGr in a Gr-in, Gr-out configuration. a QE (%) vs. incident photon energy. b QE normalized to the highest value from the PC side. c Photon energy cutoff indicating the work function. Extrapolating lines are shown in dash. d Work function of the PCs deposited on the graphene substrate with different thicknesses. Gr thickness = 0 is for PC deposited on SS as a reference

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