期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 20, 页码 4463-4469出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c00942
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资金
- National Science Centre Poland within the MAESTRO program [2020/38/A/ST3/00214]
- Ministry of Science and Higher Education, Poland [DIR/WK/2018/07]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0019345]
- EUR grant NanoX [ANR-17-EURE-0009]
- National Science Centre, Poland [2018/31/B/ST3/02111, 2017/27/B/ST3/00205]
- European Union [871106]
This study reveals the exciton fine structure of (PEA)2PbI4 single crystals using low temperature magneto-optical spectroscopy and provides valuable quantification of the fine structure splitting in (PEA)2PbI4. The results support the standard multiband, effective-mass theories for the exciton fine structure in 2D perovskites.
Applications of two-dimensional (2D) perovskites have significantly outpacedthe understanding of many fundamental aspects of their photophysics. The optical response of2D lead halide perovskites is dominated by strongly bound excitonic states. However, acomprehensive experimental verification of the excitonfine structure splitting and associatedtransition symmetries remains elusive. Here we employ low temperature magneto-opticalspectroscopy to reveal the excitonfine structure of (PEA)2PbI4(here PEA is phenyl-ethylammonium) single crystals. We observe two orthogonally polarized bright in-plane freeexciton (FX) states, both accompanied by a manifold of phonon-dressed states that preservethe polarization of the corresponding FX state. Introducing a magneticfield perpendicular tothe 2D plane, we resolve the lowest energy dark exciton state, which although theoreticallypredicted, has systematically escaped experimental observation (in Faraday configuration)until now. These results corroborate standard multiband, effective-mass theories for theexcitonfine structure in 2D perovskites and provide valuable quantification of the finestructure splitting in (PEA)2PbI4
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