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

Journal Article · · Advanced Optical Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7]
  1. Univ. of Utah, Salt Lake City, UT (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of South Florida, Tampa, FL (United States)
  3. Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE)
  4. National Renewable Energy Laboratory (NREL), Golden, CO (United States); Hong Kong University of Science and Technology (HKUST) (Hong Kong)
  5. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  6. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  7. Univ. of Utah, Salt Lake City, UT (United States)

Here, 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.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308; SC0014579
OSTI ID:
1992033
Report Number(s):
NREL/JA--5900-83640; MainId:84413; UUID:bc3b33da-bb07-4af4-993e-5453276153f3; MainAdminID:69992
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 18 Vol. 11; ISSN 2195-1071
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)