Evaluation of electron-phonon interactions in halide perovskites toward semiconductor optical refrigeration

Yasuhiro Yamada; Yuto Kajino; Yoshihiko Kanemitsu

doi:10.1117/12.2655039

15 March 2023 Evaluation of electron-phonon interactions in halide perovskites toward semiconductor optical refrigeration

Yasuhiro Yamada, Yuto Kajino, Yoshihiko Kanemitsu

Author Affiliations +

Proceedings Volume 12437, Photonic Heat Engines: Science and Applications V; 1243704 (2023) https://doi.org/10.1117/12.2655039
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Semiconductor optical refrigeration utilizes the energy upconversion of light via anti-Stokes (AS) photoluminescence (PL), which occurs through a phonon-assisted optical absorption process. This process is advantageous for semiconductors with strong electron-phonon (e-ph) interactions, such as lead halide perovskites. We discuss the significance of short-range e-ph interactions in the AS-PL process, rather than the long-range Fröhlich interactions. Short-range e-ph interactions induce Urbach tail absorption, which is experimentally evaluated via the steepness parameter. We simulate the impact of the steepness parameter on the photo-cooling gain and efficiency. We also focus on halide perovskite CsPbBr₃ quantum dots embedded in a Cs₄PbBr₆ host crystal, which possess both near-unity PL quantum efficiency and strong e-ph interactions, and quantitatively evaluate their AS-PL properties. Based on the spectroscopic results, we discuss the possibility of semiconductor optical refrigeration using halide perovskite quantum dots.

Conference Presentation

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Yasuhiro Yamada, Yuto Kajino, and Yoshihiko Kanemitsu "Evaluation of electron-phonon interactions in halide perovskites toward semiconductor optical refrigeration", Proc. SPIE 12437, Photonic Heat Engines: Science and Applications V, 1243704 (15 March 2023); https://doi.org/10.1117/12.2655039

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