期刊
NANO TODAY
卷 39, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2021.101164
关键词
Perovskite solar cell; Bulk heterojunction; Fullerene; Additive engineering; Defect passivation
资金
- National Key Research and Development Program of China [2017YFA0402800]
- National Natural Science Foundation of China [51925206, U1932214]
- Collaborative Innovation Program of Hefei Science Center [2020HSC-CIP0 04]
The study developed a novel perfluoroalkyl and pyridine-cofunctionalized fullerene derivative, which achieved double-site defect passivation of perovskite film and a champion power conversion efficiency of 20.10% for inverted BHJ-PVKSCs. Additional experiments with a non-fluoro-substituted pyridine-functionalized fullerene derivative demonstrated the crucial role of the perfluoroalkyl group in efficiency enhancement.
Bulk heterojunction (BHJ) perovskite solar cells (PVKSCs) are advantageous in passivating defects and fa-cilitating electron extraction/transport. Most of the reported fullerene derivatives involved in BHJ-PVKSCs render single-site interactions, limiting their passivation effect. Herein, we developed a perfluoroalkyl and pyridine-cofunctionalized fullerene derivative (C-60-PyF15), and applied it as an additive of CH3NH3PbI3 layer to construct inverted (p-i-n) BHJ-PVKSCs, affording double-site defect passivation of perovskite film and a champion power conversion efficiency of 20.10%, which is among the highest values for fullerene-incorporated inverted BHJ-PVKSCs. To elucidate the crucial role of the perfluoroalkyl group in efficiency enhancement, another analogous novel non-fluoro-substituted pyridine-functionalized fullerene derivative with the same chain length of alkyl group (C-60-PyH15) was also synthesized, which afforded a champion PCE of 19.22% and is lower than that of C-60-PyF15. The double-site defect passivation ability of C-60-PyF15 is resulted from the coordination interaction of the pyridine moiety with Pb2+ ions and hydrogen bonding between the fluorine atom within the perfluoroalkyl group and the CH3NH3+ cations. These enable ordered orientation of CH3NH3+ and suppressed ion migration, leading to efficiency enhancement and improved ambient and thermal stabilities. (C) 2021 Elsevier Ltd. All rights reserved.
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