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However, current CTL design predominantly focuses on molecular structure engineering, while systematic morphological control of CTLs remains largely underexplored. Herein, we report a seed\u2010initiated epitaxial growth strategy to construct well\u2010ordered fibrillar electron transport layers (ETLs) with tunable fiber lengths and narrow dispersity. This nanofiber\u2010textured ETL provides dedicated pathways for efficient electron transport and extraction, while its enlarged contact area strengthens interlayer adhesion, improving both interfacial charge transport and mechanical integrity. Using this ETL, power conversion efficiencies of 20.6% in rigid binary OSCs and 19.1% in flexible ones are achieved. The nanofibrillar ETL also exhibits broad active layer compatibility, excellent thickness tolerance, and outstanding mechanical stability. This work provides new insights into ETL morphological engineering as a strategy to overcome interfacial bottlenecks, unlocking significant efficiency gains in OSCs.<\/jats:p>","DOI":"10.1002\/anie.7455224","type":"journal-article","created":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T14:33:16Z","timestamp":1791210796000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient and Robust Organic Solar Cells Enabled by Nanofibrillar Electron Transport Layer via Seed\u2010Initiated Epitaxial Growth"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-3957-2599","authenticated-orcid":false,"given":"Lei","family":"Yang","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Technology State Key Laboratory of Chemical Engineering and Low\u2010Carbon Technology Tianjin University  Tianjin China"},{"name":"Department of Chemistry City University of Hong Kong  Kowloon 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