biostudies-literatureZhang Zthe Global STEM ProfessorshipGeneral Research Fund from the Hong Kong Research Grants CouncilEarly Career Scheme from the Hong Kong Research Grants CouncilDepartment of Education of Guangdong ProvinceHong Kong Polytechnic UniversityInnovation and Technology Commission - Hong Konge19793https://www.ebi.ac.uk/biostudies/studies/S-EPMC12933009biostudies-literatureUnknown38(12)Perovskite solar cells (PSCs) have demonstrated substantial potential due to their superior optoelectronic performance, but rapid and often poorly controlled crystallization during dynamic solution processing frequently leads to defective crystal growth and compromised film quality. Herein, we introduce a strategy utilizing polar polymers to intricately regulate solvent polarity and evaporation kinetics, thereby modulating the dynamics of perovskite crystallization. Particularly, the strongly polarized, high-population fluorinated groups in poly(pentafluorostyrene) strongly interact with solvent molecules in the precursor solution, stabilizing the solvent-containing intermediate phase and controlling the exfoliation of solvent molecules during perovskite crystallization. Direct imaging by Advanced materials (Deerfield Beach, Fla.)Polarize the Solvent to Regulate the Intermediate Phase and Dynamic Crystallization of Perovskite Films.PMC12933009CityU11317422CityU11304420153061221‐BDCM25305023P0051623MHP/233/231-BDCM2024ZDZX3079Ouyang SCai SWang FSun YZhou XHuang YXing GZhang ZHu HSo SKWang WTsang SWWu TWang YfalsePolarize the Solvent to Regulate the Intermediate Phase and Dynamic Crystallization of Perovskite Films.Perovskite solar cells (PSCs) have demonstrated substantial potential due to their superior optoelectronic performance, but rapid and often poorly controlled crystallization during dynamic solution processing frequently leads to defective crystal growth and compromised film quality. Herein, we introduce a strategy utilizing polar polymers to intricately regulate solvent polarity and evaporation kinetics, thereby modulating the dynamics of perovskite crystallization. Particularly, the strongly polarized, high-population fluorinated groups in poly(pentafluorostyrene) strongly interact with solvent molecules in the precursor solution, stabilizing the solvent-containing intermediate phase and controlling the exfoliation of solvent molecules during perovskite crystallization. Direct imaging by 2026-01-01T00:00:00Z2026 Feb2026-07-16T21:39:47.406Z2026-07-10T03:15:27.915ZS-EPMC129330094153109910.1002/adma.202519793