Aqueous Synthesis of Methylammonium Lead Halide Perovskite Nanocrystals |
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| Authors: | Dr Chong Geng Prof Shu Xu Prof Haizheng Zhong Prof Andrey L Rogach Prof Wengang Bi |
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| Institution: | 1. Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics & Information Engineering, Hebei University of Technology, Tianjin, China;2. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science & Engineering, Beijing Institute of Technology, Haidian District, Beijing, China;3. Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, China |
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| Abstract: | Methylammonium lead halide perovskite nanocrystals offer attractive optoelectronic properties but suffer from fast degradation in the presence of water. In contradiction to this observation, we demonstrate the possibility of a direct aqueous synthesis of CH3NH3PbX3 (X=Br or Cl/Br) nanocrystals through the reaction between the lead halide complex and methylamine when the pH is maintained in the range of 0–5. Under these synthetic conditions, the positively charged surface of the perovskite nanocrystals and the proper ionic balance help to prevent their decomposition in water. Additional surface capping with organic amine ligands further improves the photoluminescence quantum yield of the perovskite nanocrystals to values close to 40 %, ensures their stability under ambient conditions for several months, and their photoluminescence performance under continuous 0.1 W mm?2 405 nm light irradiation for over 250 hours. |
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| Keywords: | aqueous synthesis lead halide complexes nanomaterials perovskite phases pH |
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