Crystal Structures and Photoluminescence of a Two-Dimensional Perovskite

ORAL

Abstract

Arguably the biggest challenge of the high-efficiency perovskite solar cells, such as CH3NH3PbI3 and CH(NH2)2PbI3, is their device instability. A recent study of 2D perovskite compounds, butylammonium methylammonium lead iodide perovskite, [CH3(CH2)3NH3]2(CH3NH3)n-1PbnI3n+1, proposed a solution to this problem. This class of materials shows a maximum photovoltaic efficiency of 12.52%, without any obvious degradation over thousands of hours under standard light illumination and humidity test. This talk focuses on the study of temperature-dependent crystal structures, along with the photovoltaic properties of the 2D 1-layer (n = 1) perovskite material. We have performed elastic and inelastic neutron scattering, Raman scattering, and photoluminescence measurements on a powder sample of the 1-layer system ([CH3(CH2)3NH3]2PbI4). Our analysis of the data illuminates the evolution of the lattice structure, rotational and vibrational dynamics with temperature, and their connection to the charge carrier lifetime of the solar cell will be discussed.

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Presenters

  • Depei Zhang

    University of Virginia, Department of Physics, University of Virginia

Authors

  • Depei Zhang

    University of Virginia, Department of Physics, University of Virginia

  • Tianran Chen

    University of Virginia, Department of Physics, University of Virginia

  • Alexander Chen

    University of Virginia

  • Wei-Liang Chen

    National Taiwan University, Center for Condensed Matter Sciences, National Taiwan University

  • Maiko Kofu

    Japan Proton Accelerator Research Complex

  • Craig Brown

    NCNR, NIST, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology

  • Leland Harriger

    NIST Center for Neutron Research, NCNR, NIST, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology, NIST center for Neutron Scattering

  • Madhusudan Tyagi

    NIST Center for Neutron Research, National Institute of Standards and Technology, Univ of Maryland-College Park

  • Mina Yoon

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Joshua Choi

    University of Virginia, Department of Chemical Engineering, University of Virginia

  • Seunghun Lee

    University of Virginia, Department of Physics, University of Virginia