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Trion-Facilitated Dexter-Type Energy Transfer in a Cluster of Single Perovskite CsPbBr3 Nanocrystals

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【作者】 曹增乐胡逢睿满再琴张春峰张伟华王晓勇肖敏

【Author】 Zengle Cao;Fengrui Hu;Zaiqin Man;Chunfeng Zhang;Weihua Zhang;Xiaoyong Wang;Min Xiao;National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures,and School of Physics, Nanjing University;College of Engineering and Applied Sciences, Nanjing University;Department of Physics, University of Arkansas;

【通讯作者】 胡逢睿;张伟华;王晓勇;

【机构】 National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures,and School of Physics, Nanjing UniversityCollege of Engineering and Applied Sciences, Nanjing UniversityDepartment of Physics, University of Arkansas

【摘要】 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 CsPbBr3 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 CsPbBr3 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 CsPbBr3 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.

【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 CsPbBr3 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 CsPbBr3 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 CsPbBr3 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.

【关键词】 sizedDextercolloidalsubsequentexcitationpreparebandsneighboringlongerperovskite
【基金】 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);the PAPD of Jiangsu Higher Education Institutions
  • 【文献出处】 Chinese Physics Letters ,中国物理快报(英文版) , 编辑部邮箱 ,2020年12期
  • 【分类号】TB383.1;TN36
  • 【被引频次】1
  • 【下载频次】31
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