Angle Resolved Photoelectron Spectroscopy Studies on the Surface Electronic Structure of Tetragonal CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>

ORAL

Abstract

Organic-inorganic halide perovskites (OIHP) have been highlighted in optoelectronics research area for the last decade. OIHPs exhibit long carrier diffusion length (λ) despite of its moderate-to-low mobility (μ). In case of CH3NH3PbI3, the highest value of reported λ reaches beyond μm while the μ is about only <100cm2s-1V-1. Several underlying mechanisms have been proposed in order to account for the unusual transport property. One of them is the suppression of charge-carrier recombination by formation of spin-polarized indirect bandgap due to the Rashba effect. However, experimental evidence of such effect is lacking so far and there are ongoing debates regarding its presence and effectiveness. In this presentation, we present our unprecedented high-quality ARPES results measured on single crystal CH3NH3PbI3 (001) surface. We also show circular dichroism ARPES (CD-ARPES) from which we can exploit the information about spin-polarization of electronic structure and discuss the compatibility of the Rashba scenario. We believe our work provides important experimental evidence of one of the most debatable issues in OIHPs.

*This study was supproted by the NRF of Korea [NRF-2018R1D1A1B07051050, 2018R1A6A1A03025582 and 2017R1A5A1014862 (SRC program: vdWMRC center)]

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Presenters

  • Jeehong Park

    • Institute of Physics and Applied Physics, Yonsei University

Authors

  • Jeehong Park

    • Institute of Physics and Applied Physics, Yonsei University

  • Donghee Kang

    • Institute of Physics and Applied Physics, Yonsei University

  • Jaehyun Yang

    • Institute of Physics and Applied Physics, Yonsei University

  • Young Woo Choi

    • Department of Physics, Yonsei University, Seoul 03722, Korea
    • Department of Physics, Yonsei University, Seoul, 03722, Korea
    • Institute of Physics and Applied Physics, Yonsei University

  • Soonsang Huh

    • Seoul Natl Univ
    • Center for Correlated Electron Systems, Institute for Basic Science

  • Hyoung Joon Choi

    • Department of Physics, Yonsei University, Seoul 03722, Korea
    • Department of Physics, Yonsei University, Seoul, 03722, Korea
    • Institute of Physics and Applied Physics, Yonsei University

  • Changyoung Kim

    • Physics, Seoul Natl Univ
    • Physics and Astronomy, Seoul National University
    • Department of Physics and Astronomy, Seoul National University
    • Department of Physics and Astronomy, Seoul Natl Univ
    • Seoul Natl Univ
    • Center for Correlated Electron Systems, Institute for Basic Science

  • Hyunbok Lee

    • Department of Physics, Kangwon National University

  • Yeonjin Yi

    • Institute of Physics and Applied Physics, Yonsei University