Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 35, Pages 29917-29923Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07960
Keywords
ternary solar cells; small molecules; same conjugated backbone; good miscibility; hole relay
Funding
- International Science & Technology Cooperation Program of China [2013DFG52740]
- National Natural Science Foundation of China [51473053]
- Fundamental Research Funds for the Central Universities
- U.S. Office of Naval Research [N00014-15-1-2244]
- DOE, Office of Science, and Office of Basic Energy Sciences
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Ternary organic solar cells (OSCs) are very attractive for further enhancing the power conversion efficiencies (PCEs) of binary ones but still with a single active layer. However, improving the PCEs is still challenging because a ternary cell with one more component is more complicated on, phase separation behavior. If the two donors or two.acceptors have similar chemical structures, good miscibility can be expected to reduce the try-and-error work. Herein, we report ternary devices based on two small molecule donors with the same backbone but different substituents. Whereas both binary devices show PCEs about 9%, the PCE of the ternary cells is enhanced to 10.17% with improved fill factor and short-circuit current values and external quantum efficiencies almost in-the whole absorption wavelength region from 440 to 850 nm. The same backbone enables the donors miscible at molecular level, and the donor with a higher HOMO level plays hole relay process to facilitate the charge transportation in the ternary devices. Since side-chain engineering has been well performed to tune the active materials' energy levels in OSCs, our results suggest that their ternary systems are promising for further improving the binary cells' performance although their absorptions are not complementary.
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