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Here, a photo\u2010patternable solid\u2010state electrolyte based on \ud835\udf04\u2010carrageenan (\ud835\udf04\u2010CGN) and poly(ethylene glycol) diacrylate (PEGDA) is presented, enabling high\u2010performance OECTs and complementary circuits. The \ud835\udf04\u2010CGN electrolyte exhibits high ionic conductivity (&gt;10 mS cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), comparable to a 0.1\n                    <jats:sc>m<\/jats:sc>\n                    NaCl aqueous electrolyte, while supporting precise patterning down to 15 \u00b5m, fast transient response times, minimal hysteresis, and excellent stability in both p\u2010 and n\u2010type OECTs. Compact solid\u2010state NAND\/NOR gates (500 \u00d7 800 \u00b5m\n                    <jats:sup>2<\/jats:sup>\n                    ), 4\u2010input NAND gates (1600 \u00d7 800 \u00b5m\n                    <jats:sup>2<\/jats:sup>\n                    , 8 OECTs), and half\u2010adders (2 \u00d7 1 mm\n                    <jats:sup>2<\/jats:sup>\n                    , 18 OECTs) are demonstrated, all exhibiting correct logic functions and low\u2010voltage operation. To highlight its potential for implantable bioelectronics, solid\u2010state spiking circuits, monolithically integrated with flexible cuff electrodes, are developed for vagus nerve stimulation in mice. These findings establish \ud835\udf04\u2010CGN\u2010based solid\u2010state electrolytes as a promising platform for scalable, implantable circuits, paving the way for next\u2010generation bioelectronic devices.\n                  <\/jats:p>","DOI":"10.1002\/adma.202509314","type":"journal-article","created":{"date-parts":[[2025,8,22]],"date-time":"2025-08-22T21:19:58Z","timestamp":1755897598000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["A Photo\u2010Patternable Solid\u2010State Electrolyte for High\u2010Performance, Miniaturized, and Implantable Organic Electrochemical Transistor\u2010Based Circuits"],"prefix":"10.1002","volume":"37","author":[{"given":"Miao","family":"Xiong","sequence":"first","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 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Immunobiology Center for Bioelectronic Medicine Department of Medicine, Solna Center for Molecular Medicine Karolinska Institutet  Stockholm 17177 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qifan","family":"Li","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mary J.","family":"Donahue","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"},{"name":"Wallenberg Wood Science Center Department of Science and Technology (ITN) Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dace","family":"Gao","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han\u2010Yan","family":"Wu","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam","family":"Marks","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Oxford Oxford OX1 3TA UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yincai","family":"Xu","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and Technology Link\u00f6ping University Norrk\u00f6ping 60174 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deyu","family":"Tu","sequence":"additional","affiliation":[{"name":"Laboratory of Organic Electronics Department of Science and 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