| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Trion-Facilitated Dexter-Type Energy Transfer in a Cluster of Single Perovskite CsPbBr$_{3}$ Nanocrystals |
| Zengle Cao1, Fengrui Hu2*, Zaiqin Man2, Chunfeng Zhang1, Weihua Zhang2*, Xiaoyong Wang1*, and Min Xiao1,3 |
1National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China
2College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
3Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
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| Cite this article: |
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Zengle Cao, Fengrui Hu, Zaiqin Man et al 2020 Chin. Phys. Lett. 37 127801 |
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Abstract Semiconductor colloidal nanocrystals (NCs) can interact with each other to profoundly influence the charge transfer, transport and extraction processes after they have been assembled into a high-density film for optoelectronic device applications. These interactions normally occur among several nearby single colloidal NCs, which should be effectively separated from their surroundings to remove the ensemble average effect for fine optical characterizations. By means of atomic force microscopy (AFM) nanoxerography, here we prepare individual clusters of perovskite CsPbBr$_{3}$ NCs and perform single-particle measurements on their optical properties at the cryogenic temperature. While discrete photoluminescence bands can be resolved from the several single CsPbBr$_{3}$ NCs that are contained within an individual cluster, the shorter- and longer-wavelength bands are dramatically different in that their intensities show sub- and superlinear dependences on the laser excitation powers, respectively. This can be explained by the generation of charged excitons (trions) at high laser excitation powers, and their subsequent Dexter-type energy transfer from smaller- to larger-sized CsPbBr$_{3}$ NCs. Our findings not only suggest that these individual clusters prepared by AFM nanoxerography can serve as a potent platform to explore few-NC interactions but they also reveal the long-neglected role played by trions in channeling photo-excited energies among neighboring NCs.
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Received: 15 September 2020
Published: 08 December 2020
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| PACS: |
78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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71.35.Pq
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(Charged excitons (trions))
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78.55.-m
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(Photoluminescence, properties and materials)
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36.40.Vz
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(Optical properties of clusters)
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| Fund: Supported by the National Key R&D Program of China (Grant Nos. 2019YFA0308704 and 2017YFA0303700), the National Natural Science Foundation of China (Grant Nos. 61974058, 11574147 and 11621091), and the PAPD of Jiangsu Higher Education Institutions. |
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