Scalable Ambient Fabrication of High-Performance CsPbI2Br Solar Cells

Yuanyuan Fan, Junjie Fang, Xiaoming Chang, Ming-Chun Tang, Dounya Barrit, Zhuo Xu, Zhiwu Jiang, Jialun Wen, Huan Zhao, Tianqi Niu, Detlef M. Smilgies, Shengye Jin, Zhike Liu, Er Qiang Li, Aram Amassian, Shengzhong (Frank) Liu, Kui Zhao

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

All-inorganic halide perovskites hold promise for improving the thermal stability of perovskite solar cells (PSCs), but their moisture sensitivity significantly limits scalable fabrication of high-quality thin films over large areas under ambient conditions. Upscaling of uniform and pinhole-free coatings is further complicated by the fluid dynamics of the ink and its solidification mechanisms. For the first time, we demonstrate the control of film formation during ambient-air scalable fabrication of CsPbI2Br perovskite films using blade coating and investigate the coupling between the fluid dynamics and the structural evolution during film formation. As a result, we achieve power conversion efficiencies of 14.7% (aperture, 0.03 cm2) and 12.5% (aperture, 1.0 cm2), which is the highest performance for 1.0 cm2 all-inorganic PSCs. These results present important lessons on controlling the solidification of inks for the practical fabrication of perovskite photovoltaics.
Original languageEnglish (US)
Pages (from-to)2485-2502
Number of pages18
JournalJoule
Volume3
Issue number10
DOIs
StatePublished - Aug 15 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the National Key Research and Development Program of China (2017YFA0204800 and 2016YFA0202403), National Natural Science Foundation of China (61604092, 11772327, and 11621202), DNL Cooperation Fund CAS (DNL180311), National University Research Fund (GK201802005), the 111 Project (B14041), the National 1000 Talents Plan program (1110010341), and the King Abdullah University of Science and Technology (KAUST). CHESS is supported by the NSF award DMR-1332208. We also thank Dr. Liyang Yu and Dr. Ruipeng Li for the useful discussion with in situ analysis. Y.F. performed most of the experiments. K.Z. conceived the project. K.Z. and S.(F).L. supervised the work. Z.X. performed first-principles simulation. M.T. D.B. A.A. and D.-M.S. assisted with in situ GIWAXS measurements. Z.J. and E.Q.L. assisted with Marangoni number calculation. J.W. and S.J. assisted with TA measurements. H.Z. and Z.L. contributed to the pre-treatment of precursors. J.F. and X.C. assisted with the device fabrication. T.N. helped with the SEM analysis. All the authors contribute to the writing of the manuscript. The authors declare no competing interests.

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