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Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells

Title
Indolo[3,2-b]indole-Containing Donor-Acceptor Copolymers for High-Efficiency Organic Solar Cells
Authors
Hwang, Jae YoungPark, Jeong HunKim, Yu JinHa, Yeon HeePark, Chan EonChung, Dae SungKwon, Soon KiKim, Yun Hi
DGIST Authors
Chung, Dae Sung
Issue Date
2017-03
Citation
Chemistry Of Materials, 29(5), 2135-2140
Type
Article
Article Type
Article
Keywords
FIELD-EFFECT TRANSISTORSCONJUGATED POLYMERSCHARGE-TRANSPORTPHOTOVOLTAICS
ISSN
0897-4756
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 π-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 π-extended carbazole moieties for achieving high-performance OSCs with many of the favorable properties induced by large heteroacene blocks. © 2017 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5654
DOI
10.1021/acs.chemmater.6b04745
Publisher
AMER CHEMICAL SOC
Related Researcher
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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