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However, prevalent acceptors often act as stress concentrators, leading to film embrittlement. A general toughening approach remains elusive. Here, a broadly applicable strategy is introduced using SEEPS, an elastomeric agent with finely\u2010tailored miscibility with the acceptor to toughen OSCs. A toughening parameter\n                    <jats:italic>\u03b7<\/jats:italic>\n                    , derived from dynamic mechanical analysis is defined, that quantitatively correlates with elastomer\u2010acceptor miscibility with mechanical enhancement. SEEPS induces pronounced secondary relaxations that dissipate strain energy, yielding an over 11\u2010fold increase in fracture strain. In situ grazing\u2010incidence X\u2010ray scattering reveals that SEEPS preserves molecular packing and suppresses phase separation under strain. The resulting intrinsically stretchable OSCs retain four\u2010fifths of starting efficiency after 500 stretch\u2010release cycles at 40% strain, and sustain its four\u2010fifths efficiency at 52% strain. This work achieves record\u2010breaking efficiency over 16% while preserving exceptional mechanical stretchability, offering insights for high\u2010performance stretchable photovoltaics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202516229","type":"journal-article","created":{"date-parts":[[2025,12,5]],"date-time":"2025-12-05T14:07:34Z","timestamp":1764943654000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["A General Elastomeric Agent to Addressing Embrittlement in High\u2010Efficiency Organic Solar Cells"],"prefix":"10.1002","volume":"38","author":[{"given":"Saimeng","family":"Li","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering State Key Laboratory of Advanced Materials for Intelligent Sensing Tianjin Key Laboratory of Molecular Optoelectronic Sciences Key Laboratory of Organic Integrated Circuits Ministry of Education Collaborative Innovation Center of Chemical 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