| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Surface Passivation of Perovskite Film Using Imidazole-based Ionic Liquid for Efficient Inverted Solar Cells |
| ZHANG Yao, BI Enbing, RU Pengbin, CHEN Han
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| State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240,China |
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Abstract Since the defect on the surface of the halide perovskite crystal is more prevalent than that in the internal lattice, it seriously affects the improvement of the photoelectric conversion efficiency and stability of the perovskite solar cells. It is an effective way to further improve the quality of perovskite by reducing the density of defects on the surface of perovskite by developing a multifunctional passivator. In this paper, we first applied a multi-functional passivation material: 1-cyanopropyl-3-methylimidazole chloride salt. Coating it on the perovskite can simultaneously passivate the lead ion defects and the iodide ion defects on the surface of the perovskite, and increase the carrier lifetime by more than twice. Through this method, the photoelectric conversion efficiency of the perovskite solar cells achieved 22.53% with 40 mV enhancement on the open circuit voltage. The ionic liquid passivation could also improve the stability of solar cells. Encapsulated devices retained more than 90% of their initial efficiency after 500 h of maximum power point operation under AM1.5G illumination at 60 ℃ in air.
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Published: 25 January 2022
Online: 2022-01-26
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| Fund:This work was financially supported by the Natural Science Foundation of Shanghai (17ZR1414800,20ZR1424900) , the National Natural Science Foundation of China (51902198), and the National Postdoctoral Program for Innovative Talents and the National Postdoctoral Foundation of China (BX201700302,2018M640388). |
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2022, Vol. 36 
