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However, there are inevitably many defects generated at the surfaces or grain boundaries of CsPbI<jats:sub>2<\/jats:sub>Br perovskite films, which will serve as carrier non\u2010radiative recombination centers, and CsPbI<jats:sub>2<\/jats:sub>Br perovskite films are sensitive to water molecules to degrade, together with energy level mismatch between CsPbI<jats:sub>2<\/jats:sub>Br perovskite and carbon electrodes. Herein, 1\u2010benzyl\u20103\u2010methylimidazolium hexafluorophosphate (1\u2010B\u20103\u2010MIMPF<jats:sub>6<\/jats:sub>), an imidazolium\u2010based ionic liquid simultaneously containing benzene ring and fluorine atoms, was introduced for the modification of the perovskite\/carbon interface. The results showed that it could effectively reduce defects, enhance carrier transfer, mitigate carrier non\u2010radiative recombination, facilitate energy alignment, and block moisture intrusion. Therefore, the photovoltaic performance of the modified PSCs with ITO\/SnO<jats:sub>2<\/jats:sub>\/CsPbI<jats:sub>2<\/jats:sub>Br\/1\u2010B\u20103\u2010MIMPF<jats:sub>6<\/jats:sub>\/carbon architecture has been boosted with a champion power conversion efficiency (PCE) of 13.47\u2009%, open circuit voltage of 1.20\u2005V, short circuit current density of 14.69\u2005mA\/cm<jats:sup>2<\/jats:sup>, and fill factor of 76\u2009%. Moreover, the unencapsulated modified devices exhibited an improved stability and the PCE maintained 78\u2009% of their initial PCE after 24\u2005h storage at room temperature in a 30\u2009%\u201335\u2009% humidity environment, whereas that of the pristine devices dropped to almost zero.<\/jats:p>","DOI":"10.1002\/cssc.202400223","type":"journal-article","created":{"date-parts":[[2024,3,16]],"date-time":"2024-03-16T02:23:07Z","timestamp":1710555787000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Multifunctional Interface Modification Enables Efficient and Stable HTL\u2010Free Carbon\u2010Electroded CsPbI<sub>2<\/sub>Br Perovskite Solar Cells"],"prefix":"10.1002","volume":"17","author":[{"given":"Wei","family":"Zhao","sequence":"first","affiliation":[{"name":"Key Laboratory of Efficient and Clean Energy Utilization The Education Department of Hunan Province School of Energy and Power Engineering Changsha 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