Exciton Propagation in Two-Dimensional Hybrid Perovskites

ORAL

Abstract

Layered hybrid perovskites are a highly interesting class of materials with intriguing fundamental properties and emerging potential for optoelectronic applications. Conceptually, they represent natural quantum well systems composed of nanometer-thin sheets of inorganics separated by organic spacer molecules. Due to enhanced Coulomb interaction 2D perovskites host tightly-bound electron-hole pairs, known as excitons, dominating their optical response. While the properties of these quasiparticles have been broadly studied, their spatial behavior remains barely explored so far. Here, we report the results of our study of exciton diffusion in hBN-encapsulated 2D perovskites, monitored from liquid helium up to room temperature conditions [1]. We find efficient propagation of long-lived excitons at all temperatures above 50 K with characteristic features of free-particle transport. At lower temperatures we observe a non-trivial behavior of a rapidly expanding exciton population followed by a slow and even negative effective diffusion. We discuss our results in the context of efficient exciton-phonon coupling in a simplified framework of a semi-classical model and outline general considerations of exciton transport in these systems.
[1] J.D. Ziegler et al: 10.1021/acs.nanolett.0c02472

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Presenters

  • Barbara Meisinger

    • Department of Physics, University of Regensburg

Authors

  • Barbara Meisinger

    • Department of Physics, University of Regensburg

  • Jonas-David Ziegler

    • University of Regensburg, Germany
    • Institut für Experimentelle und Angewandte Physik, Universität Regensburg
    • Department of Physics, University of Regensburg

  • Jonas Zipfel

    • University of Regensburg, Germany
    • Department of Physics, University of Regensburg, Germany
    • Department of Physics, University of Regensburg

  • Matan Menahem

    • Department of Materials and Interfaces, Weizmann Institute of Science

  • Xiangzhou Zhu

    • Department of Physics, Technical University of Munich

  • Takashi Taniguchi

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • International Center for Materials Nanoarchitectonics, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • 8International Center for Materials Nanoarchitectonics
    • NIMS Tsukuba
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • International Center for Material Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Cheng Kung University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, International Center for Materials Nanoarchitectonics
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Kenji Watanabe

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • Research Center for Functional Materials, NIMS
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Materials, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan
    • National Institute for Materials Science, Research Center for Functional Materials
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Omer Yaffe

    • Department of Materials and Interfaces, Weizmann Institute of Science

  • David Egger

    • Department of Physics, Technical University of Munich, 85748 Garching, Germany
    • TU Munich
    • Department of Physics, Technical University of Munich
    • Department of Physics, Technial University of Munich
    • Technical University of Munich

  • Alexey Chernikov

    • University of Regensburg, Germany
    • Department of Physics, University of Regensburg, Germany
    • Institut für Experimentelle und Angewandte Physik, Universität Regensburg
    • Department of Physics, University of Regensburg