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However, further efficiency gains hinge on overcoming persistent charge\u2010generation losses in these excitonic systems. In this work, we show a simple strategy\u2010 adding a small amount of the solvent additive 1\u2010chloronaphthalene (CN)\u2010that can improve the charge generation rate and thereby the power conversion efficiency (PCE) in the widely studied acceptor Y6. We show that incorporation of trace CN induces stable morphology features that are largely independent of the processing solvents chloroform (CF) and dichloromethane (DCM). The optimized acceptor morphology significantly extends the exciton diffusion length, with CN\u2010assisted DCM yielding the longest diffusion length and thereby reducing the charge generation loss in b\u2010OSCs. Time\u2010resolved absorption spectroscopy corroborates these findings, directly linking morphology\u2010driven exciton transport with improved charge generation. The kinetic Monte Carlo (KMC) simulation reveals that the compact molecular packing mainly contributes to the long exciton diffusion lengths in the optimized morphology. Our results establish a rational design strategy for exploiting long\u2010range exciton diffusion as a key lever to minimize energy losses and advance the performance of b\u2010OSCs.<\/jats:p>","DOI":"10.1002\/smtd.70935","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T06:44:37Z","timestamp":1785912277000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Morphology\u2010Driven Exciton Diffusion Enhances the Charge Generation in Bilayer Organic Solar Cells"],"prefix":"10.1002","volume":"10","author":[{"given":"Abdul","family":"Azeez","sequence":"first","affiliation":[{"name":"Institute of Materials Research (iMR) Tsinghua Shenzhen International Graduate School  Shenzhen P.R. 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