Investor Presentaiton

Normalized intensity 2.0 Milestone #1: Demonstration of material compatibility between 2D materials and bialkali photocathodes 17μm Optical Pre-deposition Post-deposition hv e- Photocathode material Gr substrate Mesh grid 34μm N.A.Moody, H. Yamaguchi et al. US Patent 10,535,486 (2020) 100 um 1 mm 1 mm H. Yamaguchi et al. npj 2D Materials and Applications (2017) XRD K₂CsSb/sapphire K₂CsSb (002) K₂CsSb/hBN (004) 2.5 3.0 3.5 4.0 4.5 5.0 d-spacing (A) Intensity (arb. units) 3 XRF K₂CsSb/hBN Fit K Sb M 4 5 Cs Energy (KeV) • • High crystallinity achieved on 2D material (XRD) Nearly ideal stoichiometry of K1.85 CS1.08 Sb achieved on 2D material (XRF) H.Yamaguchi et al. phys. stat. solidi (a) (2019) 11/8/2021 6

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