Hot Carrier Dynamics in Perovskite Nanocrystal Solids: Role of the Cold Carriers, Nanoconfinement, and the Surface
- Thomas R. HopperThomas R. HopperDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Thomas R. Hopper
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- Andrei GorodetskyAndrei GorodetskyDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Andrei Gorodetsky
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- Ahhyun JeongAhhyun JeongDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Ahhyun Jeong
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- Franziska KriegFranziska KriegInstitute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, SwitzerlandLaboratory for Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, SwitzerlandMore by Franziska Krieg
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- Maryna I. BodnarchukMaryna I. BodnarchukInstitute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, SwitzerlandLaboratory for Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, SwitzerlandMore by Maryna I. Bodnarchuk
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- Marios MaimarisMarios MaimarisDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Marios Maimaris
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- Marine ChaplainMarine ChaplainDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Marine Chaplain
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- Thomas J. MacdonaldThomas J. MacdonaldDepartment of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Thomas J. Macdonald
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- Xiaokun HuangXiaokun HuangInstitute for High-Frequency Technology, Technische Universität Braunschweig, Schleinitzstrasse 22, 38106 Braunschweig, GermanyInnovationLab, Speyerer Strasse 4, 69115 Heidelberg, GermanyKirchhoff Institute for Physics, University of Heidelberg, 69120 Heidelberg, GermanyMore by Xiaokun Huang
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- Robert LovrincicRobert LovrincicInstitute for High-Frequency Technology, Technische Universität Braunschweig, Schleinitzstrasse 22, 38106 Braunschweig, GermanyInnovationLab, Speyerer Strasse 4, 69115 Heidelberg, GermanyMore by Robert Lovrincic
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- Maksym V. KovalenkoMaksym V. KovalenkoInstitute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, SwitzerlandLaboratory for Thin Films and Photovoltaics, Empa − Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, SwitzerlandMore by Maksym V. Kovalenko
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- Artem A. Bakulin*Artem A. Bakulin*E-mail: [email protected]Department of Chemistry, Imperial College London, London W12 0BZ, United KingdomMore by Artem A. Bakulin
Abstract

Carrier cooling is of widespread interest in the field of semiconductor science. It is linked to carrier–carrier and carrier–phonon coupling and has profound implications for the photovoltaic performance of materials. Recent transient optical studies have shown that a high carrier density in lead-halide perovskites (LHPs) can reduce the cooling rate through a “phonon bottleneck”. However, the role of carrier–carrier interactions, and the material properties that control cooling in LHPs, is still disputed. To address these factors, we utilize ultrafast “pump–push–probe” spectroscopy on LHP nanocrystal (NC) films. We find that the addition of cold carriers to LHP NCs increases the cooling rate, competing with the phonon bottleneck. By comparing different NCs and bulk samples, we deduce that the cooling behavior is intrinsic to the LHP composition and independent of the NC size or surface. This can be contrasted with other colloidal nanomaterials, where confinement and trapping considerably influence the cooling dynamics.
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