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However, efficient and stable IOPVs based on giant dimeric acceptors (GDAs) are rarely reported due to the dearth of GDAs with hypsochromic absorption (absorption onset &lt; 850 nm) and good crystallinity. Herein, two hypsochromic GDAs are proposed with different fluorination degrees, namely DY4FO\u2010V and DY6FO\u2010V, and process a systematic study of hypsochromic acceptor materials from the small molecule to dimers and polymer. Interestingly, both hypsochromic GDAs possess better crystallinity, thus faster carrier transport and suppress recombination than small\u2010molecule and polymer acceptor\u2010based devices. With extra fluorination, PM6:DY6FO\u2010V exhibits higher external quantum efficiency response and tighter packing compared with PM6:DY4FO\u2010V. As a result, PM6:DY6FO\u2010V delivers a champion efficiency over 29% under a LED illumination of 2000 lux (2600\u2009k), positioning it the highest values for GDA\u2010based IOPVs. Meanwhile, the high glass transition temperature of DY6FO\u2010V endowed corresponding devices with great photostability and enhanced mechanical stability in flexible devices, demonstrating the feasibility of practical applications of the DY6FO\u2010V\u2010based IOPVs. This research underscores the huge potential of developing hypsochromic GDAs for highly efficient IOPVs with superior stability.<\/jats:p>","DOI":"10.1002\/advs.202512690","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T20:38:18Z","timestamp":1760560698000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Indoor Organic Photovoltaics with Over 29% Efficiency and Great Stability Enabled by Giant Dimeric Acceptors with Hypsochromic Absorption and High Glass Transition Temperature"],"prefix":"10.1002","volume":"12","author":[{"given":"Bosen","family":"Zou","sequence":"first","affiliation":[{"name":"State Key Laboratory of Organic\/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"},{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ho Ming","family":"Ng","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengkai","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Organic\/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Institute for Clean Energy City University of Hong Kong  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingyuan","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Organic\/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dezhang","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zefan","family":"Yao","sequence":"additional","affiliation":[{"name":"College of Chemistry and Molecular Engineering Peking University  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongxiang","family":"Li","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University  Chengdu 610106 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunliang","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianghao","family":"Zeng","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan E.","family":"Halpert","sequence":"additional","affiliation":[{"name":"Department of Chemistry The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huawei","family":"Hu","sequence":"additional","affiliation":[{"name":"State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University  Shanghai 201620 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunhui","family":"Duan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and DevicesGuangdong 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":"Zonglong","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Institute for Clean Energy City University of Hong Kong  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tom","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The Hong Kong Polytechnic University  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wai\u2010Yeung","family":"Wong","sequence":"additional","affiliation":[{"name":"Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhi\u2010Guo","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Organic\/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"He","family":"Yan","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1936-5328","authenticated-orcid":false,"given":"Han","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology  Hong Kong 999077 China"},{"name":"Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University  Hong Kong 999077 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,15]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/aenm.202003103"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202202685"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2020.2964280"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2021.03.020"},{"key":"e_1_2_7_5_1","first-page":"3770","volume":"22","author":"Bi P.","year":"2022","journal-title":"J. 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