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Here, we employ infrared photo-induced force microscopy (IR-PiFM) to investigate the migration dynamics of MA+ and FA+ in MAPbI3, FAPbI3 and FA0.5MA0.5PbI3. These techniques allow nanoscale mapping and real-time tracking of individual cations with high chemical specificity and 250\u00a0\u03bcs temporal resolution. Our results reveal composition- and location-dependent ion transport behavior; while MA+ exhibits higher mobility in pure MAPbI3, its diffusion is significantly suppressed in the mixed-cation system. Surprisingly, FA+ and MA+ in FA0.5MA0.5PbI3 exhibit similar migration rates, suggesting a cooperative migration mechanism. Density functional theory calculations support this interpretation, showing that A-site mixing alters lattice symmetry and raises migration barriers through steric and electrostatic interactions. Bias-dependent nano-infrared imaging and open-circuit voltage measurements further show that mixed-cation perovskites confine cation motion and suppress bulk migration, leading to stabilized internal fields and improved voltage performance. These results provide direct evidence for cooperative cation migration dynamics in mixed A-cation perovskites and demonstrate that controlled cation mobility, rather than complete immobilization, may be key to achieving both efficiency and operational durability in perovskite optoelectronics.<\/jats:p>","DOI":"10.1093\/nsr\/nwag071","type":"journal-article","created":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T12:37:26Z","timestamp":1769863046000},"source":"Crossref","is-referenced-by-count":1,"title":["Quantifying cooperative FA+\/MA+ ion migration in mixed perovskites via nano-infrared imaging"],"prefix":"10.1093","volume":"13","author":[{"given":"Jing","family":"Liang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023 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,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1682-1685","authenticated-orcid":false,"given":"Jian","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,2,2]]},"reference":[{"key":"2026032817382860700_bib1","author":"NREL","year":"30  2026,","journal-title":"Best Research-Cell Efficiency Chart"},{"key":"2026032817382860700_bib2","doi-asserted-by":"publisher","first-page":"724","DOI":"10.1038\/s41586-023-05825-y","article-title":"Controlled growth of perovskite layers with volatile alkylammonium 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