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Incorporating a narrower bandgap nonfullerene acceptor (NFA) as a guest component into the host donor:NFA system broadens the absorption spectrum. However, this can also increase the nonradiative decay rate according to the energy\u2010gap law. In this work, ternary OSCs are constructed by combining a narrow bandgap AQx\u20102F (as host NFA) with a lower bandgap eC9 (as guest NFA), significantly enhancing photocurrent generation without compromising photovoltage. The addition of eC9 acts as a crystallization inducer, extending the crystallization period and increasing the ordered packing distance. This leads to suppressed trap states, elevated dielectric constant, prolonged exciton lifetime, balanced hole\/electron transport, and reduced recombination loss. Consequently, the optimized D18:AQx\u20102F:eC9 ternary OSCs achieve a champion power conversion efficiency (PCE) of 20.6% with a high open\u2010circuit voltage of 0.937\u00a0V, a short\u2010circuit current density of 27.2\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and a fill factor of 80.8%, as validated by an independently certified PCE of 20.0%, establishing a new benchmark for bulk heterojunction OSCs. This work demonstrates an effective method to simultaneously mitigate photovoltage and photocurrent losses, paving the way for high\u2010performance OSCs.\n                  <\/jats:p>","DOI":"10.1002\/adma.202500282","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T01:38:56Z","timestamp":1741743536000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":181,"title":["20.6% Efficiency Organic Solar Cells Enabled by Incorporating a Lower Bandgap Guest Nonfullerene Acceptor Without Open\u2010Circuit Voltage Loss"],"prefix":"10.1002","volume":"37","author":[{"given":"Yuanyuan","family":"Jiang","sequence":"first","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids and State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences  Beijing 100190 China"},{"name":"School of Chemical Sciences 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