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Nature Communications (NPG), Vol. 12, 673 (2021)

Highly efficient photoelectric effect in halide perovskites for regenerative electron sources

 

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.

 
Contact
Jacky EVEN

jacky.even insa-rennes.fr

+33 2 23 23 82 95

 
Partners

Rice University (Houston, USA), LANL (New Mexico, USA), Northwestern University (Evanston, USA)

 
Reference

Highly efficient photoelectric effect in halide perovskites for regenerative electron sources, F. Liu, S. Sidhik, M.A. Hoffbauer, S. Lewis 1 , A.J. Neukirch, V. Pavlenko, H. Tsai, W. Nie, J. Even, S. Tretiak, P.M. Ajayan, M.G. Kanatzidis, J.J. Crochet, N.A. Moody, J.-C. Blancon and A.D. Mohite  Nat. Commun. Vol. 12, 673, 2021, DOI : 10.1038/s41467-021-20954-6

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