期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 9, 页码 4464-4471出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b13681
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51572120, 21871143, 21533012, 21776121]
- Six Talent Peaks Project in Jiangsu Province [184080H102231]
- Nanjing Normal University Young Leading Talent Fund [184080H20210]
Perovskite and chalcogenide quantum dots (QDs) are important nano semiconductors. It has been a challenge to synthesize heterostructural QDs combining perovskite and chalcogenide with tailorable photoelectronic properties. In this report, heterostructural CsPbX3-PbS (X = Cl, Br, I) QDs were successfully synthesized via a room temperature in situ transformation route. The CsPbX3-PbS QDs show a tunable dual emission feature with the visible and near-infrared (NIR) photoluminescence (PL) corresponding to CsPbX3 and PbS, respectively. Typically, the formation and evolution of the heterostructural CsPbBr3-PbS QDs with reaction time was investigated. Femtosecond transient absorption spectroscopy (TAS) was applied to illuminate the exciton dynamics in CsPbBr3-PbS QDs. The mild synthetic method and TAS proved perovskite to PbS energy transfer may pave the way toward highly efficient QD photovoltaic and optoelectronic devices.
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