Engineering of the Exciton Binding Energies in 2D Metal Halide Perovskites

ORAL

Abstract

2D metal halide perovskites (MHPs) are a class of materials that have recently gained traction in the material science community due to the tunability of their band gap (Eg) and exciton binding energies (Eb). However, these techniques have given varied and inconsistent results. Our research group used a technique called electroabsorption to accurately and precisely measure Eg and Eb in 31 different perovskites found in our published paper [Hansen et al., Matter 6, 3463-3482 (2023)]. By measuring these MHPs we have found that a superlattice of repeating wells and barriers describes the effect the inorganic dielectric constant (metal halide layer) has on Eb.

* BYU Department of Physics and Astronomy and BYU College of Physical and Mathematical Sciences. (Carter, Blake, Emma, Daniel)National Science Foundation through a graduate research fellowship, grant 1747505. (Kameron)National Science Foundation REU program, grant 2051129. (Michele)Sloan Research Fellowship Program, DOE Award no. DE-SC0019041 (Luisa)National Science Foundation under grant 1922758. (Andre, Cindy)

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Publication: Hansen et al., Matter 6, 3463-3482 (2023)

Presenters

  • Carter M Shirley

    Brigham Young University

Authors

  • Carter M Shirley

    Brigham Young University

  • John S Colton

    Brigham Young University

  • Kameron R Hansen

    University of Utah

  • Emma McClure

    Brigham Young University

  • Michele Eggleston

    Oberlin College

  • Blake Romrell

    Brigham Young University

  • Daniel J King

    Brigham Young University

  • Luisa Whittaker-Brooks

    University of Utah

  • Cindy Wong

    University of Illinois at Urbana-Champai

  • Andre Schleife

    University of Illinois at Urbana-Champaign