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Reversible Ultra-Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystals: The Presence of Dynamic Capping |
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| Authors: | Shovon Chatterjee Pritam Dey Nilimesh Das Khushubo Tiwari Dr Tanmoy Maiti Prof Pratik Sen |
| Institution: | 1. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016 UP, India;2. Plasmonics and Perovskites Laboratory, Department of, Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208 016 UP, India;3. Department of Materials Science and Engineering, Indian Institute of, Technology Kanpur, Kanpur, 208 016 UP, India |
| Abstract: | An ultra-slow crystal growth over a period of 24 h of a newly synthesized CH3NH3Pb1/2Bi1/3I3 perovskite (MPBI) nanocrystal in non-polar toluene medium is reported here. From several spectroscopic techniques as well as from TEM analysis we found that the size of nanocrystals changes continuously with time, in spite of being capped by the ligands. Using a single molecular spectroscopic technique, we also found that this size change is not due to the stacking of nanocrystals but due to crystal growth. The notable temperature dependence and reversible nature of the nanocrystals growth is explained by the dynamic nature of the capping. The observed temperature-dependent ultra-slow growth is believed to be a pragmatic step towards controlling the size of perovskite NC in a systematic manner. |
| Keywords: | capped radius crystal growth dynamic capping hybrid perovskite nanocrystals nanotechnology |