Journal
JOULE
Volume 6, Issue 3, Pages 662-675Publisher
CELL PRESS
DOI: 10.1016/j.joule.2022.02.001
Keywords
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Funding
- National Natural Science Foundation of China [21734008, 21875216, 5212780017, 51803178, 61721005]
- National Key Research and Development Program of China [2019YFA0705900, 2017YFA0207700]
- China Postdoctoral Science Foundation [2020M671715, 2017M621907, 2019T120501]
- Zhejiang University
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By constructing ternary organic photovoltaics, the open-circuit voltage (V-oc) loss is reduced, leading to a higher voltage without sacrificing the absorbing range. In addition, the ternary blend exhibits enhanced charge transport property and a higher fill factor.
The large open-circuit voltage (V-oc) loss is currently the main obstacle for pursuing the highly efficient organic photovoltaics (OPVs). To address this issue, we construct the ternary OPVs (TOPVs) consisting of symmetric BTP-eC9 and asymmetric BTP-S9 acceptors with similar absorption profiles and demonstrate it as a feasible way to increase V-oc via reducing the energetic disorder and non-radiative decay. This strategy enables a desired higher voltage in TOPVs than those in both binary OPVs, without sacrificing absorbing range. Besides, the ternary blend exhibits enhanced charge transport property due to stronger pi-pi stacking than binary films, resulting in the enhanced fill factor (FF). Consequently, the optimal TOPV exhibits a champion efficiency of 18.8% (certified as 18.7%) with a high voltage of 0.861 V and a high FF of 79.34%, representing the best among certified single-junction OPVs. This work demonstrates an effective approach to increase V-oc, paving the way toward high-efficiency OPVs.
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