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Nevertheless, their low iontronic performance, particularly in terms of transconductance (\n                    <jats:italic>g<\/jats:italic>\n                    <jats:sub>m<\/jats:sub>\n                    ), limits their ability to acquire high\u2010precision biosignals. To address this issue, a series of poly(bithiophene)s (opg2T\u2010O, opg2T\u2010S, and opg2T\u2010Se) bearing 4,4\u2032\u2010position glycol side chains are synthesized. Upon varying furan, thiophene, and selenophene comonomers, the intramolecular noncovalent interactions are systematically tuned. Comprehensive theoretical analyses reveal that opg2T\u2010Se demonstrates stronger intramolecular Se\u00b7\u00b7\u00b7O noncovalent interactions than the S\u00b7\u00b7\u00b7O interactions in opg2T\u2010S and opg2T\u2010O, affording a more planar and rigid molecular configuration in opg2T\u2010Se. Meanwhile, opg2T\u2010Se exhibits closer\n                    <jats:italic>\u03c0<\/jats:italic>\n                    \u2013\n                    <jats:italic>\u03c0<\/jats:italic>\n                    stacking and lamellar\u2010packing and prefers an edge\u2010on orientation. Consequently, a record\u2010high geometry\u2010normalized transconductance (\n                    <jats:italic>g<\/jats:italic>\n                    <jats:sub>m,n<\/jats:sub>\n                    ) of 415\u00a0S\u00a0cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    , along with remarkable hole mobility (\n                    <jats:italic>\u00b5<\/jats:italic>\n                    = 2.99\u00a0cm\n                    <jats:sup>2<\/jats:sup>\n                    \u00a0V\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and volumetric capacitance (\n                    <jats:italic>C<\/jats:italic>\n                    * = 423.3\u00a0F\u00a0cm\n                    <jats:sup>\u22123<\/jats:sup>\n                    ) are achieved in opg2T\u2010Se based OECTs. Importantly, the opg2T\u2010Se\u2010based devices exhibits much higher signal fidelity in in\u2010vitro human electrocardiogram (ECG) than the other two devices. This study highlights the importance of intramolecular noncovalent interaction in the channel layer materials for achieving high\u2010performance OECTs.\n                  <\/jats:p>","DOI":"10.1002\/adma.202508541","type":"journal-article","created":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T12:21:53Z","timestamp":1759839713000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["High Iontronic Performance in Organic Electrochemical Transistors Enabled by Intramolecular Noncovalent Interactions"],"prefix":"10.1002","volume":"38","author":[{"given":"Guocai","family":"Liu","sequence":"first","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meng","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jikai","family":"Lv","sequence":"additional","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences  Beijing 100190 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bowei","family":"Ma","sequence":"additional","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaobin","family":"Gu","sequence":"additional","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1602-769X","authenticated-orcid":false,"given":"Yunlong","family":"Guo","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences  Beijing 100190 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunqi","family":"Liu","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences  Beijing 100190 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6102-2815","authenticated-orcid":false,"given":"Hui","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Materials Science and Opto\u2010Electronic Technology University of Chinese Academy of Sciences  Beijing 101408 P. R. China"},{"name":"School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering and Low\u2010Carbon Technology Tianjin University  Tianjin 300072 P.R. 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