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Exciton Fine Structure in 2D Perovskites: The Out‐of‐Plane Excitonic State (in EN)

Journal Article · · Advanced Optical Materials
 [1];  [2];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [5];  [1];  [2]
  1. Wroclaw Univ. of Science and Technology (Poland); Laboratoire National des Champs Magnétiques Intenses (LNCMI), Grenoble (France)
  2. Wroclaw Univ. of Science and Technology (Poland)
  3. Laboratoire National des Champs Magnétiques Intenses (LNCMI), Grenoble (France)
  4. Univ. of Warsaw (Poland)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Polish Academy of Sciences (PAS), Wrocław (Poland)

2D Ruddlesden‐Popper metal‐halide perovskites feature particularly strong excitonic effects, making them a fascinating playground for studying exciton physics. A complete understanding of the properties of this quasi‐particle is crucial to fully exploit the tremendous potential of 2D perovskites (2DP) in light emission applications. Despite intense investigations, some of the exciton properties remain elusive to date, for example, the energy‐ordering of the exciton states within the so‐called fine structure manifold. Using optical spectroscopy, it demonstrates that in the archetypical 2DP (PEA)2PbI4, in contradiction to theoretical predictions, the energy of the bright out‐of‐plane exciton state is higher than that of two in‐plane states. Having elucidated the order of exciton fine structure, it determines the g‐factor of the dark exciton transition, together with the values of the electron and hole g‐factors in the direction parallel to the c‐axis of the crystal. In this way, it provides for the first time, a complete picture of the exciton fine structure in (PEA)2PbI4 2DP.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Agence Nationale de la Recherche
Grant/Contract Number:
SC0019345
OSTI ID:
2575787
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 8 Vol. 12; ISSN 2195-1071
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
EN

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