Highly efficient photoelectric effect in halide perovskites for regenerative electron sources
Résumé
Electron sources are a critical component in a wide range of applications such as electron-beam accelerator facilities, photomultipliers, and image intensifiers for night vision. We report efficient, regenerative and low-cost electron sources based on solution-processed halide perovskites thin films when they are excited with light with energy equal to or above their bandgap. We measure a quantum efficiency up to 2.2% and a lifetime of more than 25 h. Importantly, even after degradation, the electron emission can be completely regenerated to its maximum efficiency by deposition of a monolayer of Cs. The electron emission from halide perovskites can be tuned over the visible and ultraviolet spectrum, and operates at vacuum levels with pressures at least two-orders higher than in state-of-the-art semiconductor electron sources.
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Liu-2021-Highly efficient photoelectric effect in halide perovskites.pdf (1.89 Mo)
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Liu_41467_2021_20954_MOESM1_ESM.pdf (1.42 Mo)
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