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10 October 2022 Hot carrier cooling dynamics in low-dimensional lead halide perovskites
Ben Carwithen, Thomas R. Hopper, Ziyuan Ge, Navendu Mondal, Franziska Krieg, Federico Montanarella, Martin Kroll, Karl Leo, Yana Vaynzof, Maryna Bodnarchuk, Maksym Kovalenko, Artem Bakulin
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Proceedings Volume PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI; PC1219901 (2022) https://doi.org/10.1117/12.2632229
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
Hot carrier cooling in halide perovskites is governed by the interplay of carrier-carrier and carrier-phonon interactions, and so the study of their dynamics can reveal important underlying photophysical processes operating in these materials. Here, ultrafast pump-push-probe spectroscopy is used to isolate hot carrier dynamics in lead halide perovskite nanomaterials spanning a range of sizes and shapes. A weak size-dependence is shown by cuboidal CsPbBr3 nanocrystals, while 2D CsPbBr3 nanoplatelets and Ruddlesden-Popper (PEA)2PbI4 display a hot phonon bottleneck that becomes increasingly suppressed with greater excitonic character. This is attributed to an enhanced influence of carrier-carrier scattering in low-dimensional perovskites.
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Ben Carwithen, Thomas R. Hopper, Ziyuan Ge, Navendu Mondal, Franziska Krieg, Federico Montanarella, Martin Kroll, Karl Leo, Yana Vaynzof, Maryna Bodnarchuk, Maksym Kovalenko, and Artem Bakulin "Hot carrier cooling dynamics in low-dimensional lead halide perovskites", Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC1219901 (10 October 2022); https://doi.org/10.1117/12.2632229
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KEYWORDS
Perovskite
Lead
Phonons
Solar energy
Spectroscopy
Photovoltaics
Scattering
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