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Herein, a novel\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010fluorophenylethanimidamide (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010FPEIA) spacer cation with a fluorine atom at\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010carbon of the amidine group is designed and employed to enhance the performance and stability of 2DRP PSCs. The single\u2010crystal structure of (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010FPEIA)\n                    <jats:sub>2<\/jats:sub>\n                    PbI\n                    <jats:sub>4<\/jats:sub>\n                    exhibits stronger interaction between the organic cations and inorganic skeleton, with a larger angle of Pb\u2010I\u2010Pb, thus benefiting the charge transfer and improving lattice stability of perovskite film. Furthermore, the theoretical results indicate that (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010FPEIA)\n                    <jats:sub>2<\/jats:sub>\n                    PbI\n                    <jats:sub>4<\/jats:sub>\n                    exhibits a reduction in the quantum confinement effect, which is conducive to carrier transfer. Additionally, the\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010FPEIA\u2010based perovskite film exhibits excellent crystal quality, suitable energy level arrangement, decreased trap states, and extended carrier lifetime. These enhancements boost the PCE of (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010FPEIA)\n                    <jats:sub>2<\/jats:sub>\n                    (Cs\n                    <jats:sub>0.05<\/jats:sub>\n                    FA\n                    <jats:sub>0.8<\/jats:sub>\n                    MA\n                    <jats:sub>0.15<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    Pb\n                    <jats:sub>5<\/jats:sub>\n                    I\n                    <jats:sub>16<\/jats:sub>\n                    (\n                    <jats:italic>n<\/jats:italic>\n                    = 5) device reaching 18.15% (vs phenethylammonium (PEA)\u2010based PSCs of 15.38%) along with improving the stability of unencapsulated PSCs. The findings demonstrate that introducing a fluorine atom into the alkyl group of the PEA and replacing the ammonium with the amidine group represents a novel approach for fabricating high\u2010performance and stable inverted 2DRP PSCs.\n                  <\/jats:p>","DOI":"10.1002\/smll.202410546","type":"journal-article","created":{"date-parts":[[2025,2,13]],"date-time":"2025-02-13T04:47:27Z","timestamp":1739422047000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Alkyl Fluorination Aromatic Acetamidine Cation Enhances the Lattice Stability and Performance of 2D Ruddlesden\u2010Popper Perovskite Solar Cells"],"prefix":"10.1002","volume":"21","author":[{"given":"Yunxin","family":"Zhang","sequence":"first","affiliation":[{"name":"Tianjin Key Lab for Rare Earth Materials and Applications Smart Sensing Interdisciplinary Science Center Renewable Energy Conversion and Storage Center (RECAST) School of Materials 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