Dark Exciton in 2D Hybrid Halide Perovskite Films Revealed by Magneto-Photoluminescence at High Magnetic Field

Chuang Zhang, Xiaomei Jiang, Peter Sercel, Haipeng Lu, Matthew Beard, Stephen McGill, Dimitry Semenov, Z. Valy Vardeny

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

A comprehensive study of the exciton fine structure (EFS) is presented in 2D-phenethylammonium lead iodide films using magnetic field-induced polarization of photoluminescence (PL) in both Faraday and Voigt configurations at fields up to 25 Tesla. Three exciton bands are identified in the PL spectrum associated with bound, dark, and bright excitons, respectively. Under a high magnetic field in Faraday/Voigt configuration, large field-induced circular/linear polarization is observed in the PL band related to the dark exciton, which is magnetically activated. Furthermore, it is found that the dark exciton has an anomalous field-induced circular polarization, which cannot be explained by the classical Boltzmann distribution of spin-polarized species. These findings are well explained by an effective mass model that includes exchange terms unique to the monoclinic symmetry as a perturbation of the EFS in the approximate tetragonal symmetry. It is also confirmed that the field-induced linear polarization is sensitive to the monoclinic exchange term, whereas the field-induced circular polarization is immune to such term.

Original languageAmerican English
Article number2300436
Number of pages10
JournalAdvanced Optical Materials
Volume11
Issue number18
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

NREL Publication Number

  • NREL/JA-5900-83640

Keywords

  • 2D hybrid halide perovskite
  • dark excitons
  • field induced circular/linear polarization
  • high magnetic field
  • magneto-photoluminescence
  • optical polarization

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