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While pure\u2010iodide WBG\u2010PSCs offer a fundamental solution, their development is hindered by the distinct crystallization kinetics of A\u2010site cations, which lead to severe compositional inhomogeneity, coupled with lead toxicity. Herein, we report a multifunctional ionic liquid, 1\u2010propylsulfonate\u20103\u2010methylimidazolium trifluoromethanesulfonate ([SO\n                    <jats:sub>3<\/jats:sub>\n                    H\u2010PMIm][OTf]), that addresses these challenges. The additive interacts with CsI through sulfonate\u2010Cs\n                    <jats:sup>+<\/jats:sup>\n                    coordination bonds to increase CsI solubility, anchors methylammonium (MA) and dimethylammonium (DMA) cations via hydrogen bonding, and coordinates with undercoordinated Pb\n                    <jats:sup>2+<\/jats:sup>\n                    ions through the \u2500SO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    . These synergistic interactions suppress colloidal aggregation in the precursor solution, while this coordination effect lowers the crystallization temperature of Cs\u2010based perovskites, enabling synchronous crystallization with their organic\u2010based counterparts. Consequently, homogeneous A\u2010site cation distribution across both in\u2010plane and out\u2010of\u2010plane dimensions is achieved. The resulting Cs\n                    <jats:sub>0.3<\/jats:sub>\n                    DMA\n                    <jats:sub>0.2<\/jats:sub>\n                    MA\n                    <jats:sub>0.5<\/jats:sub>\n                    PbI\n                    <jats:sub>3<\/jats:sub>\n                    pure\u2010iodide WBG\u2010PSCs deliver a champion efficiency of 22.02% with an open\u2010circuit voltage (\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>OC<\/jats:sub>\n                    ) of 1.231 V and retain 90% of initial efficiency after 3000 h under the ISOS\u2010D\u20101 protocol. Pb\n                    <jats:sup>2+<\/jats:sup>\n                    chelation and hydrophobic \u2500CF\n                    <jats:sub>3<\/jats:sub>\n                    mitigate lead leakage by over 58%. This strategy provides a versatile strategy for overcoming cation inhomogeneity and lead toxicity, enabling efficient, stable, and safe pure\u2010iodide perovskite photovoltaics.\n                  <\/jats:p>","DOI":"10.1002\/advs.77993","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T18:00:31Z","timestamp":1790532031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multifunctional Ionic Liquid Enabling Cation Homogenization and Lead Chelation for Pure\u2010Iodide Wide\u2010Bandgap Perovskite Solar Cells"],"prefix":"10.1002","author":[{"given":"Kai","family":"Wu","sequence":"first","affiliation":[{"name":"Key Laboratory of Semiconductor Photovoltaic Technology and Energy Materials of Inner Mongolia Autonomous Region School of Physical Science and Technology Inner Mongolia University  Hohhot 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