Bright and dark excitons in two-dimensional hybrid perovskites film

ORAL

Abstract

Recently 2D hybrid organic-inorganic perovskites (2D-HOIP) with Ruddlesden-Popper structure have been studied extensively. Due to dielectric confinement and quantum confinement, excitons in 2D-HOIP have much larger binding energy and smaller radius compared with their 3D HOIP counterparts; consequently, excitonic effects are more pronounced in these systems. In this work, we present a comprehensive study of the exciton fine structure utilizing magnetic field induced polarization of photoluminescence in a model 2D-HOIP, 2D-phenethylammonium lead iodide (2D-PEPI), both in Faraday and Voigt configurations with fields up to 25 Tesla. From the exciton field induced circular and linear polarizations we have identified two pairs of exciton states: the ‘bright’ exciton pair (X/Y) and the ‘dark’ exciton pair D/Z. Their related zero-field splitting (fine structure) and g-values have been determined.

*Department of Energy Office of Science, Grant DESC 0014579; Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE); National Science Foundation grant DMR 2054169

–

Presenters

  • Xiaomei Jiang

    • University of South Florida

Authors

  • Xiaomei Jiang

    • University of South Florida

  • Chuang Zhang

    • Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

  • Peter C Sercel

    • Center for Hybrid Organic Inorganic Semiconductors for Energy, Golden, CO, 80401 USA
    • CHOISE Center

  • Stephen McGrill

    • National High Magnetic Field Labs, Florida
    • National High magnetic field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

  • Dmitry Serenov

    • National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

  • Z. Valy Vardeny

    • Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112