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In particular, controlling solution\u2010state aggregation to form well\u2010defined fibrillar networks that enable high device performance is a central challenge. Here, we present a modular molecular design strategy based on the PTzBI polymer platform, enabling simultaneous tuning of energy levels, crystalline packing, and chain flexibility to address this limitation. The resulting polymer, PTzBI\u2010dF\u2010Si, integrates a fluorinated backbone and siloxane\u2010terminated side chains, showing balanced solubility and controlled solution\u2010state aggregation in\n                    <jats:italic>o<\/jats:italic>\n                    \u2010xylene. These network\u2010like solution aggregates translate into enhanced molecular crystallinity and a well\u2010organized fibrillar morphology in the solid film. The corresponding PTzBI\u2010dF\u2010Si:L8\u2010BO blends achieve a power conversion efficiency (PCE) of 19.9% in rigid OSCs. Moreover, PTzBI\u2010dF\u2010Si exhibits ductile deformation with a fracture strain of \u223c20%, leading to intrinsically stretchable OSCs with a PCE over 16%, retaining\u00a0&gt;80% of the initial PCE under 40% strain. These results highlight the promise of rational, modular polymer design in advancing nonhalogenated\u2010solvent processed, high\u2010efficiency, and mechanically robust OSCs for scalable and wearable electronic applications.\n                  <\/jats:p>","DOI":"10.1002\/anie.202514985","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T19:21:47Z","timestamp":1760556107000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Modular Design of Polymer Donors Regulates Solution Aggregation and Stretchability of Organic Solar Cells"],"prefix":"10.1002","volume":"64","author":[{"given":"Xuanang","family":"Luo","sequence":"first","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinrui","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youran","family":"Lin","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingke","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyuan","family":"Yang","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihui","family":"Xiong","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Guangzhou 510640 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Peng","sequence":"additional","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy &amp; 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