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BIT Make Breakthrough in Design and Synthesis of A-site Cation of Perovskites

release date :2019-09-22 02:57:00  |   [ close window ]ViewCount:

     Translator: News Agency of BIT, Miao Yufei

    Editor: News Agency of BIT

  Recently, Zhong Haizheng's research group from the school of Materials, Beijing Institute of Technology (BIT) made a breakthrough in the design and synthesis of A-site cation of perovskites, which was published online in Advanced Materials, a top journal in the field of Materials, on September 6, 2019. Soon after published, the paper received attention from academic media and was reported by the Nanoer.

  Halide perovskites have been widely studied in the field of photovoltaic, light-emitting diodes, laser and ferroelectric, and has become one of the key advanced scientific fields. The excellent photoelectric characteristics of perovskite materials are mainly related to the structure of lead halogen octahedron [PbX6] 4-connection and A-position molecular filler ABX3. Therefore, seeking new perovskite materials is one of the main directions to achieve original innovation and promote application development. A-position doping is one of the decisive factors to achieve high performance optoelectronic devices. However, limited by the Goldschmidt tolerance factor, there are only a few available choices including methylamine (MA), formamidine (FA), and cesium (Cs) for 3D perovskites construction. Theorists have long predicted that halogenated-methyl ammoniums are potential A-position molecules. However, due to the instability of halogenated-methylamines, the synthesis has become one of the key problems.

  Zhong Haizheng's research group is one of the research teams to be firstly reported for the study of perovskite quantum dots in the world. In previous studies, the reprecipitation preparation technology and in-situ preparation technology of perovskite quantum dots invented by them have become one of the classical methods for the preparation of perovskite quantum dots, which have been widely used by peers. Representative works include ACS Nano 2015, 9, 4533-4542, cited by Google 913 times; Advanced Materials 2016, 28, 9163-9168, cited 209 times by Google; Angew Chem 2017, 56, 1780-1783; ACS Nano 2018, 12, 8808-881; Advanced Functional Materials 2018, 1706567; Advanced Functional Materials 2019, 1903648. Recently, the research group hav improved the preparation of halogenated-methylammoniums, using the nucleophilic reaction mechanism, utilizing ammonia to react with halogenated methane, solving the difficult problem of preparation of halogenated methylamine salt, successfully synthesizing a series of halogenated amine salt. The synthetic fluorinated methylamine salt (FMABr) is used to produce 3 d FMAPbBr3 perovskite single crystal and quantum dot material. The material characterization indicates that the perovskite materials has good thermal stability and relatively lower exciton binding energy. This study breaks the limitation of A-position molecule in three-dimensional perovskite material design and provides a new material choice for perovskite optoelectronic device application, which is expected to further promote the study of perovskite optoelectronic device.

Figure 1
Perspective view of the crystal structure, 
Optical image of single crystal,
TEM images of the colloidal FMAPbBr3

  The above research results were completed by utilizing the research conditions of the interdisciplinary platform "low-dimensional quantum structure and device laboratory" of BIT and "advanced materials experimental center" of the School of Materials Science and Engineering. And the research was supported by the National Natural Science Foundation for Excellent Young Scholars of China (61722502) and the Key Program of National Natural Science of China (61735004). The first author is Huang Sheng, a doctoral student, and the corresponding author is professor Zhong Haizheng. The spectral characterization was supported by professor Han Junbo from the High Magnetic Field Center of Huazhong University of Science and Technology. The analysis of single crystal was completed by teacher Wang Lin of the School of Mechatronical Engineering of BIT. Graduate student Huang Peng, postdoctoral scholar Wang Lei and special researcher Chen Yu have participated in the study.

 

Profile of Huang Sheng:
       Huang Sheng, a 2016 grade doctoral student at school of Materials Science and Engineering, BIT, mainly studies on the design and synthesis of new perovskits. He has published 15 SCI papers and filed 6 domestic invention patent applications as the first applicant, one of which was submitted to PCT international patent application.

Contents of Huang’s representative papers:
1.  Adv. Mater. 2019, 31, 1903830. First author.
2.  Sci Bull. 2018, 63, 1254-1259. First author.
3.  Angew Chem. 2017, 56, 1780-1783. Co-first author.
4.  J. Am. Chem. Soc. 2018, 140, 11705-11715. Co-first author.
5.  Adv. Mater. 2018, 30, 1800544. Second author.
5.  Adv. Mater. 2018, 30, 1800544. Second author.

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