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To surmount this hurdle, a water\u2010obstructing guest (WOG) strategy is proposed to attenuate the interaction of the active layer with water molecules, reduce defects in blend films, and enhance the devices stability under high relative humidity (RH) conditions by introducing a siloxane\u2010containing polymer D18\u2010SiO. In addition to suppressing trap density, the WOG with hydrophobic and low surface free energy characteristics, forms a capping layer that blocks moisture penetration while preserving ideal nano\u2010micromorphology with high crystallinity and tight packing properties. Power conversion efficiencies (PCE) of &gt;19% is reported for spin coating OSCs fabricated across an RH range of 20 to 90%, and PCE of &gt;17% blade coating OSCs at 90% RH. The D18\u2010SiO, serves as a protective barrier to enhance the device stability, and the corresponding unencapsulated OSCs retained 80.7% of its initial performance in air (\u2248 40% RH) after 600\u2010h maximum power point tracking under continuous light illumination, showcasing great potential in designing WOG strategy for large\u2010scale production of air\u2010processed OSCs.<\/jats:p>","DOI":"10.1002\/advs.202412190","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T12:40:47Z","timestamp":1740055247000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Siloxane Decorated Water\u2010Obstructing Guest for Efficient Air\u2010Processed OSCs"],"prefix":"10.1002","volume":"12","author":[{"given":"Yurong","family":"He","sequence":"first","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wentao","family":"Miao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyu","family":"Hu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junchi","family":"Su","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aziz","family":"Saparbaev","sequence":"additional","affiliation":[{"name":"Institute of Ion\u2010plasma and Laser Technologies National University of Uzbekistan  Tashkent 100174 Uzbekistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Wan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingnan","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Engineering Chalmers University of Technology  G\u00f6teborg 41296 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuda","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Novel Biomass\u2010based Environmental and Energy Materials in Petroleum and Chemical Industry School of Chemical Engineering and Pharmacy Wuhan Institute of Technology  Wuhan 430205 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huimin","family":"Xiang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ergang","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Engineering Chalmers University of Technology  G\u00f6teborg 41296 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xunchang","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6794-7416","authenticated-orcid":false,"given":"Renqiang","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), School of Optoelectronic Materials &amp; Technology Jianghan University  Wuhan 430056 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,20]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"crossref","DOI":"10.1002\/adma.202406879","volume":"36","author":"Guan S.","year":"2024","journal-title":"Adv. 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