Journal
JOULE
Volume 3, Issue 3, Pages 846-857Publisher
CELL PRESS
DOI: 10.1016/j.joule.2019.01.009
Keywords
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Funding
- ONR [N00141512322]
- KAUST's Center Partnership Fund [3321]
- U.S. Department of Energy [DE-AC02-05CH11231]
- Natural Science Foundation of China [21472012]
- Thousand Youth Talents Plan of China
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Herein, we report ternary organic solar cells with a power conversion efficiency (PCE) of 14.0%. By incorporating 10 wt % of BIT-4F-T in the PTB7-Th:IEICO-4F blend, we obtain an enhancement of all photovoltaic parameters compared to the binary devices, leading to a 15% performance improvement in ternary blend. The high photocurrent in 10% BIT-4F-T blend results from a complementary absorption profile of donor components and a hole transfer from BIT-4F-T to PTB7-Th. Morphological and device characterizations reveal that the addition of 10% BIT-4F-T acts not only as a sensitizer but also as a solid processing aid, which is beneficial for charge generation and transport. The effect of the third component is observed in different non-fullerene and fullerene OSCs. Our study demonstrates that careful selection of a third component, where dual sensitizing and processing-aid effects are observed, can be a design strategy to achieve a concomitant improvement in all photovoltaic parameters.
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