期刊
NANO LETTERS
卷 19, 期 10, 页码 7054-7061出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b02520
关键词
Exciton; fine structure splitting; perovskite; bulk; photoluminescence; reflectance
类别
资金
- BLAPHENE project - IDEX Toulouse, Emergence program, the EUR grant [NanoX ANR-17-EURE-0009]
- STRABOT project - IDEX Toulouse, Emergence program, the EUR grant [NanoX ANR-17-EURE-0009]
- PAN-CNRS collaboration within the PIGS 2016-2018 agreement
- EPSRC [EP/M05173/1, EP/N01085X/1]
- Polish Ministry of Science and Higher Education within the Mobilnosc Plus program [1648/MOB/V/2017/0]
- French National Research Agency (ANR IPER-Nano2) [ANR-18-CE30-0023-01]
- Agence Nationale de la Recherche (ANR) [ANR-18-CE30-0023] Funding Source: Agence Nationale de la Recherche (ANR)
- EPSRC [EP/N01085X/1] Funding Source: UKRI
Exciton fine structure splitting in semiconductors reflects the underlying symmetry of the crystal and quantum confinement. Because the latter factor strongly enhances the exchange interaction, most work has focused on nanostructures. Here, we report on the first observation of the bright exciton fine structure splitting in a bulk semiconductor crystal, where the impact of quantum confinement can be specifically excluded, giving access to the intrinsic properties of the material. Detailed investigation of the exciton photoluminescence and reflection spectra of a bulk methylammonium lead tribromide single crystal reveals a zero magnetic field splitting as large as similar to 200 mu eV. This result provides an important starting point for the discussion of the origin of the large bright exciton fine structure splitting observed in perovskite nanocrystals.
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