Research could dramatically lower cost of electron sources

Phys.org  February 1, 2021
An international team of researchers (USA – Los Alamos National Laboratory, Rice University, Northwestern University, France) has discovered 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. They measured a quantum efficiency up to 2.2% and a lifetime of more than 25 h. Importantly, even after degradation, the electron emission could be completely regenerated to its maximum efficiency by deposition of a monolayer of alkali antimonide and tellurides (Cs2Te, K2CsSb, Cs3Sb). 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. The technology could slash the cost of semiconductor electron sources, key components in devices ranging from night-vision goggles and low-light cameras to electron microscopes and particle accelerators…read more. Open Access TECHNICAL ARTICLE

Characterization of the halide perovskite thin films. Credit: Nature Communications volume 12, Article number: 673 (2021)

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