期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-017-00261-9
关键词
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资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K036769/1, EP/K022237/1, EP/M024938/1]
- Fundamental Research Funds for the Central Universities [XDJK2017B033]
- Southwest University [20710945]
- EPSRC [EP/M024938/1, EP/K022237/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K022237/1, EP/M024938/1] Funding Source: researchfish
A metal-organic hybrid perovskite (CH3NH3PbI3) with three-dimensional framework of metal-halide octahedra has been reported as a low-cost, solution-processable absorber for a thin-film solar cell with a power-conversion efficiency over 20%. Low-dimensional layered perovskites with metal halide slabs separated by the insulating organic layers are reported to show higher stability, but the efficiencies of the solar cells are limited by the confinement of excitons. In order to explore the confinement and transport of excitons in zero-dimensional metal-organic hybrid materials, a highly orientated film of (CH3NH3)(3)Bi2I9 with nanometresized core clusters of Bi2I9 3-surrounded by insulating CH3NH3+ was prepared via solution processing. The (CH3NH3)(3)Bi2I9 film shows highly anisotropic photoluminescence emission and excitation due to the large proportion of localised excitons coupled with delocalised excitons from intercluster energy transfer. The abrupt increase in photoluminescence quantum yield at excitation energy above twice band gap could indicate a quantum cutting due to the low dimensionality.
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