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Unexpected finding #1: QE enhancement of bialkali photocathodes by coating metal substrates with graphene 23 2019 pissa www.pss-a.com applications and materials science (c) Photocathode material (d) 1.41 Substrate Atomically thin layer hv e- Photocathode material Atomically thin layer Metal substrate Relative quantum efficiency 1.00 Graphene coating 0.91 0.82 No graphene 0.73 0.64 WILEY-VCH Enhanced mirroring effect Selected as a journal cover 10μm Relative enhancement 1.3- 1.2- Side view 1.1- 1.0- 400 • Model Experiment 500 600 Wavelength (nm) ↑ ↑ QE 1.0 0.8 0.6 0.4 Coated Name: Imags 1320 375nm Los Alamos NATIONAL LABORATORY 405nm 532nm 633nm H. Yamaguchi et al. phys. stat. solidi (a) (2019) 5μm 11

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