Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells
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SCOPUS
- Title
- Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells
- Authors
- Hwang, J.; Park, J.; Kim, Y.J.; Ha, Y.H.; Park, C.E.; Chung, D.S.; Kwon, S.-K.; Kim, Y.-H.
- Date Issued
- 2017-03
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The organic solar cell (OSC) performance of a series of new donor-acceptor copolymers containing indolo[3,2-b]indole as a key donor block and benzothiadiazole (BT) units with various degrees of fluorination as acceptors is reported. Compared with the simple carbazole unit, the strategically developed indolo[3,2-b]indole unit is found to significantly extend ��-conjugation and thus increase the intermolecular interactions of the resulting copolymer, as probed by density functional theory calculations, photophysical studies, and structural/morphological analyses. In addition, fluorination of BT can facilitate nanostructuring of the copolymers, mainly due to further planarization of the backbone, which leads to apparently higher hole/electron charge carrier mobilities. The OSC properties of this series of new copolymers blended with fullerene show a strong dependence on the fine and continuous fibrous nanostructure of the blend film. The indolo[3,2-b]indole-based copolymer with singly fluorinated BT units possesses optimal intermolecular interactions and achieves the highest power conversion efficiency of 8.84% under AM 1.5G illumination. This result shows the potential of ��-extended carbazole moieties for achieving high-performance OSCs with many of the favorable properties induced by large heteroacene blocks. ? 2017 American Chemical Society.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92121
- DOI
- 10.1021/acs.chemmater.6b04745
- ISSN
- 0897-4756
- Article Type
- Article
- Citation
- CHEMISTRY OF MATERIALS, vol. 29, no. 5, page. 2135 - 2140, 2017-03
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