Lewis Base-Mediated Perovskite Crystallization as Revealed by In Situ, Real-Time Optical Absorption Spectroscopy
| Autor: | Hao-Yi Wang, Yi Wang, Shuai Yuan, Xi-Cheng Ai, Xinli Wang, Sun Yang, Jian-Ping Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
In situ
Materials science Absorption spectroscopy Crystal growth 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Crystallinity Chemical engineering law General Materials Science Lewis acids and bases Physical and Theoretical Chemistry Crystallization 0210 nano-technology Perovskite (structure) |
| Zdroj: | The Journal of Physical Chemistry Letters. 12:5357-5362 |
| ISSN: | 1948-7185 |
| Popis: | The strategy of Lewis base modification has been shown to be rather effective in fabricating high-quality perovskite crystals; however, the underlying mechanisms remain controversial owing to the lack of any systematic characterization of the crystallization process. Herein, we report a novel non-invasive optical technique, termed vertical reflection-type in situ, real-time absorption spectroscopy, to investigate the mechanisms of Lewis base-mediated optimization of perovskite crystallinity by visualizing the entire energetic landscape of crystal growth. We show that by virtue of the urea additive, a prototypical Lewis base, the growth kinetics is accelerated prominently by decreasing the activation energy from 73.7 to 41.7 kJ/mol. In addition, the self-passivation of structural disorder during thermal annealing is identified, which is shown to be further strengthened by urea modification toward a shallower distribution of trap states. |
| Databáze: | OpenAIRE |
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