Abstract
Controlling the nucleation and growth of organic-inorganic hybrids perovskite is of key importance to improve the morphology and crystallinity of perovskite films. However, the growth mechanism of perovskite films based on classical crystallization theory is not fully understood. Here, we develop a supersaturation controlled strategy (SCS) to balance the nucleation and crystal growth speeds. By this strategy, we are able to find an ideal supersaturation region to realize a balance of nucleation and crystal growth, which yields highly crystallized perovskite films with micrometer-scale grains. Besides, we provide a thoughtful analysis of nucleation and growth based on the fabrication of the perovskite films. As a result, the highest photovoltaic power conversion efficiencies (PCE) of 19.70% and 20.31% are obtained for the planar and the meso-superstructured devices, respectively. This strategy sheds some light for understanding the film growth mechanism of high quality perovskite film, and it provides a facile strategy to fabricate high efficiency perovskite solar cells.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2016YFA0204000), the National Natural Science Foundation of China (U1632118, 21571129), Shanghai Tech Start-Up Funding, 1000 Young Talent program, and Science and Technology Commission of Shanghai Municipality (16JC1402100, 16520720700).
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Liu, D., Zhou, W., Tang, H. et al. Supersaturation controlled growth of MAFAPbI3 perovskite film for high efficiency solar cells. Sci. China Chem. 61, 1278–1284 (2018). https://doi.org/10.1007/s11426-018-9250-6
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DOI: https://doi.org/10.1007/s11426-018-9250-6