Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 12, Pages 4625-4631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja1112595
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Funding
- NSF [DMR-0954280]
- ONR [N000140911016]
- DuPont
- Carolina Energy Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001011]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0954280] Funding Source: National Science Foundation
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Recent research advances on conjugated polymers for photovoltaic devices have focused on creating low band gap materials, but a suitable band gap is only one of many performance criteria required for a successful conjugated polymer. This work focuses on the design of two medium band gap (similar to 2.0 eV) copolymers for use in photovoltaic cells which are designed to possess a high hole mobility and low highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. The resulting fluorinated polymer PBnDT-FTAZ exhibits efficiencies above 7% when blended with [6,6]-phenyl C-61-butyric acid methyl ester in a typical bulk heterojunction, and efficiencies above 6% are still maintained at an active layer thicknesses of 1 mu m. PBnDT-FTAZ outperforms poly(3-hexylthiophene), the current medium band gap polymer of choice, and thus is a viable candidate for use in highly efficient tandem cells. PBnDT-FTAZ also highlights other performance criteria which contribute to high photovoltaic efficiency, besides a low band gap.
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