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Indoor organic photovoltaics (IOPVs) have emerged as promising candidates due to their ability to effectively harness indoor light. However, efficient polymer donors tailored for indoor conditions remain rare, as most high\u2010performance photoactive materials have been developed primarily for outdoor environments. Here, a series of PM6\u2010derived terpolymers, PB2FQxn (\n                    <jats:italic>n<\/jats:italic>\n                    = 5, 10, 15, and 20) is presented, incorporating a quinoxaline\u2010based electron\u2010accepting monomer 2,3\u2010bis(5\u2010(2\u2010ethylhexyl)\u20104\u2010fluorothiophen\u20102\u2010yl)\u20106,7\u2010difluoroquinoxaline (B2FQx) as a third component. Introducing the B2FQx monomeric unit into the polymer backbone enables favorable fine\u2010tuning of the optical, electrochemical, and molecular packing properties. In particular, when blended with L8\u2010BO, PB2FQx15\u2010based devices achieve remarkable power conversion efficiencies exceeding 30% under both light\u2010emitting diode (LED) 1000 lx and fluorescent lamp (FL) 1000 lx illumination. This impressive performance is attributed to the deep\u2010lying highest occupied molecular orbital (HOMO) energy level of PB2FQx15 and its optimal miscibility with L8\u2010BO. Overall, it is demonstrated that the design of terpolymers incorporating the combination of two electron\u2010accepting units paves the way to enhance the photovoltaic properties of IOPVs.\n                  <\/jats:p>","DOI":"10.1002\/smll.202504603","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T09:52:26Z","timestamp":1760089946000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Impact of Quinoxaline Units in Random Terpolymers on Enhancing Indoor Organic Photovoltaics: Lowering HOMO Level and Improving Miscibility"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-2598-1506","authenticated-orcid":false,"given":"Huijeong","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Chemistry Ulsan National Institute of Science and Technology (UNIST)  Ulsan 44919 Republic of 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