Volume 130, Issue 19 pp. 5457-5461
Zuschrift

Lead-Free Silver-Bismuth Halide Double Perovskite Nanocrystals

Bin Yang

Bin Yang

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

University of the Chinese Academy of Sciences, Beijing, 100039 P. R. China

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Junsheng Chen

Junsheng Chen

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

Department of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden

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Songqiu Yang

Songqiu Yang

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

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Feng Hong

Feng Hong

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

University of the Chinese Academy of Sciences, Beijing, 100039 P. R. China

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Lei Sun

Lei Sun

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

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Peigeng Han

Peigeng Han

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

University of the Chinese Academy of Sciences, Beijing, 100039 P. R. China

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Prof. Dr. Tõnu Pullerits

Prof. Dr. Tõnu Pullerits

Department of Chemical Physics and NanoLund, Chemical Center, Lund University, P.O. Box 124, 22100 Lund, Sweden

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Prof. Dr. Weiqiao Deng

Prof. Dr. Weiqiao Deng

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

Institute of Molecular Sciences and Engineering, Shandong University, Qingdao, P. R. China

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Prof. Dr. Keli Han

Corresponding Author

Prof. Dr. Keli Han

State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023 P. R. China

Institute of Molecular Sciences and Engineering, Shandong University, Qingdao, P. R. China

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First published: 07 March 2018
Citations: 152

Abstract

Lead-free perovskite nanocrystals (NCs) were obtained mainly by substituting a Pb2+ cation with a divalent cation or substituting three Pb2+ cations with two trivalent cations. The substitution of two Pb2+ cations with one monovalent Ag+ and one trivalent Bi3+ cations was used to synthesize Cs2AgBiX6 (X=Cl, Br, I) double perovskite NCs. Using femtosecond transient absorption spectroscopy, the charge carrier relaxation mechanism was elucidated in the double perovskite NCs. The Cs2AgBiBr6 NCs exhibit ultrafast hot-carrier cooling (<1 ps), which competes with the carrier trapping processes (mainly originate from the surface defects). Notably, the photoluminescence can be increased by 100 times with surfactant (oleic acid) added to passivate the defects in Cs2AgBiCl6 NCs. These results suggest that the double perovskite NCs could be potential materials for optoelectronic applications by better controlling the surface defects.

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