Fluorine-Containing Passivation Layer via Surface Chelation for Inorganic Perovskite Solar Cells

Hao Zhang; Wanchun Xiang; Xuejiao Zuo; Xiaojing Gu; Shiang Zhang; Yachao Du; Zhiteng Wang; Yali Liu; Haifeng Wu; Peijun Wang; Qingyue Cui; Hang Su; Qingwen Tian; Shengzhong Frank Liu

doi:10.1002/anie.202216634

Fluorine-Containing Passivation Layer via Surface Chelation for Inorganic Perovskite Solar Cells

Angew Chem Int Ed Engl. 2023 Feb 1;62(6):e202216634. doi: 10.1002/anie.202216634. Epub 2022 Dec 28.

Authors

Hao Zhang¹, Wanchun Xiang¹, Xuejiao Zuo¹, Xiaojing Gu¹, Shiang Zhang¹, Yachao Du¹, Zhiteng Wang¹, Yali Liu¹, Haifeng Wu², Peijun Wang¹, Qingyue Cui¹, Hang Su¹, Qingwen Tian¹, Shengzhong Frank Liu^{1

3}

Affiliations

¹ Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119, P. R. China.
² State Key Laboratory of Organic-Inorganic Composites, Key Lab of Biomedical Materials of Natural Macromolecules, Ministry of Education, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, No. 15, East Road, North Third Ring, Chaoyang District, Beijing, 100029, P. R. China.
³ Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, No. 457, Zhongshan Road, Dalian, Liaoning 116023, P. R. China.

PMID: 36480237
DOI: 10.1002/anie.202216634

Abstract

Minimizing surface defect is vital to further improve power conversion efficiency (PCE) and stability of inorganic perovskite solar cells (PSCs). Herein, we designed a passivator trifluoroacetamidine (TFA) to suppress CsPbI_3-x Br_x film defects. The amidine group of TFA can strongly chelate onto the perovskite surface to suppress the iodide vacancy, strengthened by additional hydrogen bonds. Moreover, three fluorine atoms allow strong intermolecular connection via intermolecular hydrogen bonds, thus constructing a robust shield against moisture. The TFA-treated PSCs exhibit remarkably suppressed recombination, yielding the record PCEs of 21.35 % and 17.21 % for 0.09 cm² and 1.0 cm² device areas, both of which are the highest for all-inorganic PSCs so far. The device also achieves a PCE of 39.78 % under indoor illumination, the highest for all-inorganic indoor photovoltaic devices. Furthermore, TFA greatly improves device ambient stability by preserving 93 % of the initial PCE after 960 h.

Keywords: Chelation; Defect Passivation; Inorganic; Perovskite; Solar Cells.

Abstract

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