Combined Precursor Engineering and Grain Anchoring Leading to MA-Free, Phase-Pure, and Stable alpha-Formamidinium Lead Iodide Perovskites for Efficient Solar Cells
alpha-Formamidinium lead iodide (alpha-FAPbI(3)) is one of the most promising candidate materials for high-efficiency and thermally stable perovskite solar cells (PSCs) owing to its outstanding optoelectrical properties and high thermal stability. However, achieving a stable form of alpha-FAPbI(3) where both the composition and the phase are pure is very challenging. Herein, we report on a combined strategy of precursor engineering and grain anchoring to successfully prepare methylammonium (MA)-free and phase-pure stable alpha-FAPbI(3) films. The incorporation of volatile FA-based additives in the precursor solutions completely suppresses the formation of non-perovskite delta-FAPbI(3) during film crystallization. Grains of the desired alpha-phase are anchored together and stabilized when 4-tert-butylbenzylammonium iodide is permeated into the alpha-FAPbI(3) film interior via grain boundaries. This cooperative scheme leads to a significantly increased efficiency close to 21 % for FAPbI(3) perovskite solar cells. Moreover, the stabilized PSCs exhibit improved thermal stability and maintained approximate to 90 % of their initial efficiency after storage at 50 degrees C for over 1600 hours.
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Ling, X., Zhu, H., Xu, W., Liu, C., Pan, L., Ren, D., Yuan, J., Larson, B. W., Gratzel, C., Kirmani, A. R., Ouellette, O., Krishna, A., Sun, J., Zhang, C., Li, Y., Zakeeruddin, S. M., Gao, J., Liu, Y., Durrant, J. R., et al. (2021). Combined Precursor Engineering and Grain Anchoring Leading to MA-Free, Phase-Pure, and Stable alpha-Formamidinium Lead Iodide Perovskites for Efficient Solar Cells. Angewandte Chemie International Edition, 60(52), 27299–27306. https://doi.org/10.1002/anie.202112555
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WOS:000719981700001
2021-11-18
60
52
27299
27306
REVIEWED
EPFL