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Wide-bandgap (WBG) perovskite solar cells (PSCs) hold significant promise for various applications. However, issues such as substantial open-circuit voltage (VOC) deficit and halide phase separation have hindered their rapid development. Herein, additive engineering was utilized by introducing the multifunctional additive 2- (trifluoromethanesulfonyl)aminoethyl methacrylate (TFSMA) into the WBG perovskite absorber layer, leading to a significant enhanced VOC and operational stability in corresponding PSCs. Sulfonic acid groups of TFSMA interact with the uncoordinated lead ions (Pb2+) and halide vacancies, thereby suppressing non-radiative recombination. Additionally, the highly electronegative fluorine ions (F- ) effectively inhibit phase separation, enhancing film stability under rigorous conditions. Ultimately, the 1.77 eV WBG PSC achieved a conversion efficiency of 18.28% with VOC of 1.304 V. Moreover, the encapsulated PSC maintained 93% of its initial efficiency after continuous operation for 200 hours under 1 sun illumination.
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