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To address these challenges, we introduced a nanostructured solid polymer electrolyte (NSPE) featuring high\u2010density nanoscale ion\u2010transport channels embedded within a mechanically robust polymer matrix. These nanochannels provide efficient ion\u2010conduction pathways while minimizing light scattering. Using a complementary WO\n                    <jats:sub>3<\/jats:sub>\n                    \/NiO electrochromic configuration, we evaluated the effect of the NSPE architecture on device performance. The resulting device exhibited a high bleached\u2010state transmittance of 74.5% and a large optical modulation of 63.7% in the visible region. Notably, the device exhibited rapid switching kinetics, with coloration and bleaching times of 11.8 and 2.1 s, respectively, together with a high coloration efficiency of 146.7 cm\n                    <jats:sup>2<\/jats:sup>\n                    C\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    . Furthermore, the electrolyte enabled the successful fabrication of both large\u2010area (80\u00a0mm \u00d7 80\u00a0mm) and flexible electrochromic devices while retaining electrochromic functionality, highlighting its scalability and mechanical adaptability. These results demonstrate that nanochannel\u2010engineered solid electrolytes provide an effective strategy for achieving high\u2010performance, transparent, and mechanically versatile electrochromic devices for next\u2010generation smart window applications.\n                  <\/jats:p>","DOI":"10.1002\/smtd.71120","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T07:10:44Z","timestamp":1791875444000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Highly Transparent and Fast\u2010Switching Solid\u2010State Electrochromic Devices With Nanostructured Solid Polymer Electrolytes"],"prefix":"10.1002","author":[{"given":"Ju\u2010Hyeon","family":"Min","sequence":"first","affiliation":[{"name":"Department of Polymer Science and Engineering Kumoh National Institute of Technology  Gumi\u2010si Gyeongbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Won\u2010Jang","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering Pohang University of Science and Technology (POSTECH)  Pohang\u2010si Gyeongbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1353-8988","authenticated-orcid":false,"given":"Gi\u2010Ra","family":"Yi","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering Pohang University of Science and Technology (POSTECH)  Pohang\u2010si Gyeongbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3372-6532","authenticated-orcid":false,"given":"Seog\u2010Jin","family":"Jeon","sequence":"additional","affiliation":[{"name":"Department of Polymer Science and Engineering Kumoh National Institute of Technology  Gumi\u2010si Gyeongbuk Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,13]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"crossref","unstructured":"N. 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