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Here, we identify a counterintuitive role of water (H\n                    <jats:sub>2<\/jats:sub>\n                    O) as a morphology\u2010regulating agent in ternary organic solar cells (OSCs), traditionally considered an impurity. Molecular dynamics simulations reveal that the dual hydrogen\u2010bonding capacity of H\n                    <jats:sub>2<\/jats:sub>\n                    O drives the formation of dynamic hydrogen\u2010bonding networks (HBNs). Continuous HBNs facilitate the migration of the third component into donor\u2010enriched domains through encapsulation, thereby stabilizing alloy\u2010like morphologies. While this HBN\u2010driven transition fails in single\u2010donor solvent systems such as ethanol, it extends to both fullerene and non\u2010fullerene blends in multi\u2010donor or acceptor environments. To render the mechanism applicable in organic processing, we adopted a co\u2010solvent strategy and identified a critical regime at a water\u2010to\u2010chloroform volume ratio of 0.06:1. At this threshold, trace H\n                    <jats:sub>2<\/jats:sub>\n                    O reproduces the alloy\u2010like behavior in neat H\n                    <jats:sub>2<\/jats:sub>\n                    O without compromising solubility, providing practical utility for device processing. Analyses of H\n                    <jats:sub>2<\/jats:sub>\n                    O containing CB, DMSO, and THF co\u2010solvents further confirm the general applicability of the HBN mechanism across distinct solvent environments. This work redefines H\n                    <jats:sub>2<\/jats:sub>\n                    O as a functional additive, establishes HBN engineering as a general framework for morphology control, and suggests broader implications for functional materials governed by weak interactions.\n                  <\/jats:p>","DOI":"10.1002\/advs.202517146","type":"journal-article","created":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T05:59:23Z","timestamp":1767592763000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Hydrogen\u2010Bonding Networks Enabled by Trace Water for Morphological Design in Ternary Organic Solar Cells"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-7005-623X","authenticated-orcid":false,"given":"Yue","family":"Ren","sequence":"first","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming\u2010Yue","family":"Sui","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun","family":"Geng","sequence":"additional","affiliation":[{"name":"Institute of Functional Material Chemistry, Faculty of Chemistry Northeast Normal University Changchun Jilin 130024 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui\u2010Cheng","family":"Qin","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6802-2197","authenticated-orcid":false,"given":"Ming\u2010Yang","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5236-9753","authenticated-orcid":false,"given":"Guang\u2010Yan","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5247-2937","authenticated-orcid":false,"given":"Xin","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Faculty of Science Institute of Quantum Science and Technology Yanbian University  Yanji Jilin 133002 P. R. China"},{"name":"Department of Collaborative Innovation Center of Chemistry for Energy Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials MOE Key Laboratory of Computational Physical Sciences Fudan University Shanghai 200438 P. R. 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