Crystallization kinetics of organic–inorganic trihalide perovskites and the role of the lead anion in crystal growth

Moore, David T. and Sai, Hiroaki and Tan, Kwan W. and Smilgies, Detlef-M. and Zhang, Wei and Snaith, Henry J. and Wiesner, Ulrich and Estroff, Lara A. (2015) Crystallization kinetics of organic–inorganic trihalide perovskites and the role of the lead anion in crystal growth. Journal of the American Chemical Society, 137 (6). pp. 2350-2358. ISSN 0002-7863

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Abstract

Methylammonium lead halide perovskite solar cells continue to excite the research community due to their rapidly increasing performance which, in large part, is due to improvements in film morphology. The next step in this progression is control of the crystal morphology which requires a better fundamental understanding of the crystal growth. In this study we use in situ X-ray scattering data to study isothermal transformations of perovskite films derived from chloride, iodide, nitrate, and acetate lead salts. Using established models we determine the activation energy for crystallization and find that it changes as a function of the lead salt. Further analysis enabled determination of the precursor composition and showed that the primary step in perovskite formation is removal of excess organic salt from the precursor. This understanding suggests that careful choice of the lead salt will aid in controlling crystal growth, leading to superior films and better performing solar cells.

Keywords:Crystallization Kinetics, Organic–Inorganic Trihalide Perovskites, NotOAChecked
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F131 Crystallography
F Physical Sciences > F120 Inorganic Chemistry
F Physical Sciences > F390 Physics not elsewhere classified
Divisions:College of Science > School of Chemistry
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ID Code:22666
Deposited On:19 Mar 2016 15:10

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