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Impeding anion exchange to improve composition stability of CsPbX3 (X=Cl, Br) nanocrystals through facilely fabricated Cs4PbX6 shell |
| Zhaohui Shen(申朝晖)1,2, Pengjie Song(宋鹏杰)1,2, Bo Qiao(乔泊)1,2, Jingyue Cao(曹靖玥)1,2, Qiongyu Bai(白琼宇)1,2, Dandan Song(宋丹丹)1,2, Zheng Xu(徐征)1,2, Suling Zhao(赵谡玲)1,2, Gaoqian Zhang(张高倩)1,2, Yuanjun Wu(吴元均)3 |
1 Key Laboratory of Luminescence and Optical Information(Beijing Jiaotong University), Ministry of Education, Beijing 100044, China;
2 Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China;
3 Shenzhen China Star Optoelectronics Technology Co., Ltd., Shenzhen 518132, China |
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Abstract Inorganic lead halide perovskite nanocrystals (NCs) with superior photoelectric properties are expected to have excellent performance in many fields. However, the anion exchange changes their features and is unfavorable for their applications in many fields. Hence, impeding anion exchange is important for improving the composition stability of inorganic lead halide perovskite NCs. Herein, CsPbX3 (X=Cl, Br) NCs are coated with Cs4PbX6 shell to impede anion exchange and reduce anion mobility. The Cs4PbX6 shell is facily fabricated on CsPbX3 NCs through high temperature injection method. Anion exchange experiments demonstrate that the Cs4PbX6 shell completely encapsulates CsPbX3 NCs and greatly improves the composition stability of CsPbX3 NCs. Moreover, our work also sheds light on the potential design approaches of various heterostructures to expand the application of CsPbM3 (M=Cl, Br, I) NCs.
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Received: 30 May 2019
Revised: 12 June 2019
Accepted manuscript online:
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PACS:
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61.46.Df
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(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))
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62.23.Eg
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(Nanodots)
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73.63.Bd
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(Nanocrystalline materials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11474018, 61704007, and 61575019), the National Key Research and Development Program of China (Grant No. 2017YFB0404501), the Fundamental Research Funds for the Central Universities, China (Grant No. 2017RC034), and the Shenzhen China Star Optoelectronics Technology Co., Ltd. |
Corresponding Authors:
Suling Zhao
E-mail: slzhao@bjtu.edu.cn
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Cite this article:
Zhaohui Shen(申朝晖), Pengjie Song(宋鹏杰), Bo Qiao(乔泊), Jingyue Cao(曹靖玥), Qiongyu Bai(白琼宇), Dandan Song(宋丹丹), Zheng Xu(徐征), Suling Zhao(赵谡玲), Gaoqian Zhang(张高倩), Yuanjun Wu(吴元均) Impeding anion exchange to improve composition stability of CsPbX3 (X=Cl, Br) nanocrystals through facilely fabricated Cs4PbX6 shell 2019 Chin. Phys. B 28 086102
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