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Perspective: Understanding of ripening growth model for minimum residual PbI2
and its limitation in the planar perovskite solar cells
M. Xiao, F. Huang, W. Huang, Y. Dkhissi, Y. Zhu, J. Etheridge, A. Gray-Weale, U. bach, Y.-B. Cheng, and L. Spiccia, Angew. Chem. 126, 10056 (2014).
Y.-J. Jeon, S. Lee, R. Kang, J. E. Kim, J. S. Yeo, S. H. Lee, S. S. Kim, J. M. Yun, and D. Y. Kim, Sci. Rep. 4, 6953 (2014).
R. J. Stoke and D. F. Evans, in Fundamentals of Interfacial Engineering (Wiley-VCH, 1996), Chap. 3.
S.-J. Kang and L. Sintering, in Densification, Grain Growth and Microstructure (Butterworth-Heinemann, 2005), Chap. 15.
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The power conversion efficiency of lead halide perovskite
solar cells recently surpassed 22.1%. In this study, we suggest the perovskite absorber growth mechanism of the two-step process could be explained by an Ostwald ripening growth model for planar-structure perovskite
solar cells. We attempt to find out the source of two main problems such as unreacted PbI2 and non-uniformed morphology by the proposed ripening growth mechanism and experimental results. This growth mechanism opens the way toward understanding a key aspect of the photovoltaic operation of high-efficiency, two-step perovskite
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