Identifying the Bandgap of Two-dimensional Perovskite CsPb<sub>2</sub>Br<sub>5 </sub>

ORAL

Abstract

CsPb2Br5 is a 2D perovskite where single layer Cs acts as a spacer, monolayer PbBr6 octahedrons are edge shared. Although CsPb2Br5 was synthesized more than 10 years ago, only recently it began to draw a lot of attention. Despite extensive research over past two years, its fundamental bandgap and basic electronic and optical properties still remain controversial: is this a wide bandgap indirect semiconductor or a direct bandgap material with strong green luminescence at ~520 nm? In this talk, I will discuss the reason for different observations and present our result of the bandgap investigation of CsPb2Br5.

*Welch Foundation E-1728

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Presenters

  • Jiming Bao

    • University of Houston
    • Department of Electrical and Computer Engineering, University of Houston
    • Univ of Houston

Authors

  • Chong Wang

    • Yunnan University

  • Yanan Wang

    • University of Houston
    • Univ of Houston

  • Yizhou Ni

    • Department of Physics and the Texas Center for Superconductivity, University of Houston
    • Department of Physics and Texas Center for Superconductivity at University of Houston
    • Department of Physics and Texas Center for Superconductivity, University of Houston
    • Univ of Houston

  • Viktor Hajdev

    • Univ of Houston

  • Xinghua Su

    • Changan University

  • Shuo Chen

    • Department of Physics and TcSUH, University of Houston
    • Texas Center for Superconductivity
    • Department of Physics and Texas Center for Superconductivity, University of Houston
    • Department of Physics and the Texas Center for Superconductivity, University of Houston
    • Department of Physics and Texas Center for Superconductivity at University of Houston
    • Univ of Houston

  • Zhiming Wang

    • UESTC China
    • University of Electronic Science and Technology of China
    • Paul Scherrer Institute

  • Zhifeng Ren

    • Department of Physics and Texas Center of Superconductivity, University of Houston
    • Department of Physics and TcSUH, University of Houston
    • Univ of Houston
    • University of Houston
    • Department of Physics and Texas Center for Superconductivity at University of Houston
    • Physics, Univ of Houston

  • Jiming Bao

    • University of Houston
    • Department of Electrical and Computer Engineering, University of Houston
    • Univ of Houston