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Although solvent additives are widely used to regulate morphology, their volatility often compromises reproducibility and long\u2010term stability. Here, we systematically investigate four positional isomers of dibromonaphthalene (DBN): 1,8\u2010, 1,5\u2010, 2,7\u2010, and 2,6\u2010DBN, as solid\u2010state additives in PM6:Y6\u2010based OSCs. Despite identical chemical compositions, the DBN isomers exhibit distinct molecular symmetry and crystallization kinetics, leading to fundamentally different impacts on acceptor aggregation and phase organization. Among them, 2,6\u2010DBN, featuring a highly symmetric configuration and moderate supercooling, enables balanced crystallization kinetics during thermal annealing. This kinetically accessible ordering promotes compact\n                    <jats:italic>\u03c0\u2013\u03c0<\/jats:italic>\n                    stacking, favorable vertical phase distribution, and reduced energetic disorder in the active layer. Consequently, charge carrier mobility is enhanced, non\u2010radiative recombination losses are suppressed, and balanced charge transport is achieved, yielding a champion power conversion efficiency of 19.65% in PM6:Y6 devices. These results highlight crystallization kinetics, rather than additive crystallinity alone, as a key determinant for morphology control, providing a generalizable strategy for rational solid additive design in high\u2010performance OSCs.\n                  <\/jats:p>","DOI":"10.1002\/smll.73632","type":"journal-article","created":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T08:38:16Z","timestamp":1777624696000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Crystallization Kinetics Directed by Additive Symmetry for Morphology Control in High\u2010Efficiency Organic Solar Cells"],"prefix":"10.1002","volume":"22","author":[{"given":"Keteng","family":"Zhu","sequence":"first","affiliation":[{"name":"Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University  Suzhou Jiangsu P.R. 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