Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-20954-6
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Funding
- ARO STIR project N-mensional interfaces [W911NF-19-1-0353]
- LANL Laboratory Directed Research and Development Funds (LDRD) program
- National Nuclear Security Administration of the U.S. Department of Energy [89233218NCA000001]
- Institut Universitaire de France
- U.S. Department of Energy, Office of Science [SC0012541]
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Electron sources are crucial in various applications, and this study presents an efficient, regenerative, and cost-effective electron source based on solution-processed halide perovskite thin films with a quantum efficiency of up to 2.2% and a lifetime exceeding 25 hours.
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 25h. 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. Electron sources play as important component in a wide range of applications. Here, the authors demonstrate efficient, regenerative, and low-cost electron sources based on solution-processed halide perovskite thin films with quantum efficiency up to 2.2% and a lifetime of more than 25 h.
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