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In particular, eliminating the use of toxic solvents such as N,N\u2010dimethylformamide (DMF) and 2\u2010methoxyethanol in slot\u2010die coating remains a major challenge. Here, a green solvent engineering strategy is presented that reduces hazardous solvent content by incorporating ethanol, a benign, low toxicity solvent, into the perovskite precursor solution. In the formulation, the fraction of hazardous solvents is reduced from 50% to 30% by volume. The introduction of ethanol improves substrate wetting and optimizes vapor pressure, both of which are key for achieving uniform film formation in scalable coating processes. Notably, increasing the ethanol content enhances the crystallinity and morphological uniformity of the perovskite films fabricated via slot\u2010die coating. As a result, a champion power conversion efficiency of 23.72% is achieved, and improved device stability is demonstrated under continuous operation, with performance maintained for over 750 hours under maximum power point tracking. This work highlights a viable pathway toward environmentally responsible and scalable PSC manufacturing.<\/jats:p>","DOI":"10.1002\/smll.202510529","type":"journal-article","created":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T18:57:48Z","timestamp":1763146668000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Ethanol\u2010Assisted Green\u2010Solvent\u2010Based Strategy for Slot\u2010Die Coated Perovskite Solar Cells with over 70% Eco\u2010Friendly Solvent Content"],"prefix":"10.1002","volume":"21","author":[{"given":"Jae Won","family":"Ahn","sequence":"first","affiliation":[{"name":"School of Civil Environmental and Architectural Engineering Korea University  Seoul 02841 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-3647-6902","authenticated-orcid":false,"given":"Sung 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