Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Over 24% efficient MA-free CsxFA1−xPbX3 perovskite solar cells
Authors: Wang, Siyang
Tan, Liguo
Zhou, Junjie
Li, Minghao
Zhao, Xing
Li, Hang
Tress, Wolfgang
Ding, Liming
Graetzel, Michael
Yi, Chenyi
et. al: No
DOI: 10.1016/j.joule.2022.05.002
Published in: Joule
Volume(Issue): 6
Issue: 6
Page(s): 1344
Pages to: 1356
Issue Date: 2022
Publisher / Ed. Institution: Cell Press
ISSN: 2542-4351
Language: English
Subject (DDC): 621.3: Electrical, communications, control engineering
Abstract: Methylammonium (MA)-free perovskites such as CsxFA1-xPbX3 (CsFA) show excellent thermal stability, favoring their use in perov-skite solar cells (PSCs). However, the power conversion efficiency (PCE) of CsFA lags behind that of MA-containing formulations due to the difficulty in controlling the film morphology. Herein, we report innovative morphology engineering using solution deposition of a mixture of CsBr, PbI2, and PbCl2 followed by vacuum evaporation of formamidinium iodide (FAI) to fabricate CsFA films. The introduction of a chloride precursor leads to larger grain sizes, forming a high-quality CsFA film under annealing. This enables the realization of robust CsFA-based PSCs with the highest reported PCE up to 24.1% (certified 23.9%) for 0.1 cm2 and 22.8% for 1 cm2 devices. Moreover, the unencapsulated evaporation device shows excellent stability with negligible efficiency decline after 20,000 h of storage in dry air or 1,000 h of exposure to 50% humidity, which is much better than the device prepared using the solution procedure.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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Wang, S., Tan, L., Zhou, J., Li, M., Zhao, X., Li, H., Tress, W., Ding, L., Graetzel, M., & Yi, C. (2022). Over 24% efficient MA-free CsxFA1−xPbX3 perovskite solar cells. Joule, 6(6), 1344–1356.
Wang, S. et al. (2022) ‘Over 24% efficient MA-free CsxFA1−xPbX3 perovskite solar cells’, Joule, 6(6), pp. 1344–1356. Available at:
S. Wang et al., “Over 24% efficient MA-free CsxFA1−xPbX3 perovskite solar cells,” Joule, vol. 6, no. 6, pp. 1344–1356, 2022, doi: 10.1016/j.joule.2022.05.002.
WANG, Siyang, Liguo TAN, Junjie ZHOU, Minghao LI, Xing ZHAO, Hang LI, Wolfgang TRESS, Liming DING, Michael GRAETZEL und Chenyi YI, 2022. Over 24% efficient MA-free CsxFA1−xPbX3 perovskite solar cells. Joule. 2022. Bd. 6, Nr. 6, S. 1344–1356. DOI 10.1016/j.joule.2022.05.002
Wang, Siyang, Liguo Tan, Junjie Zhou, Minghao Li, Xing Zhao, Hang Li, Wolfgang Tress, Liming Ding, Michael Graetzel, and Chenyi Yi. 2022. “Over 24% Efficient MA-Free CsxFA1−xPbX3 Perovskite Solar Cells.” Joule 6 (6): 1344–56.
Wang, Siyang, et al. “Over 24% Efficient MA-Free CsxFA1−xPbX3 Perovskite Solar Cells.” Joule, vol. 6, no. 6, 2022, pp. 1344–56,

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