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High-Performance All-Polymer Solar Cells Enabled by an n-Type Polymer Based on a Fluorinated Imide-Functionalized Arene

Authors
Sun, HuiliangTang, YuminKoh, Chang WooLing, ShaohuaWang, RuizhiYang, KunYu, JianweiShi, YongqiangWang, YingfengWoo, Han YoungGuo, Xugang
Issue Date
12-4월-2019
Publisher
WILEY-V C H VERLAG GMBH
Keywords
all-polymer solar cells; fluorination; imide-functionalized arene; n-type polymer; organic electronics
Citation
ADVANCED MATERIALS, v.31, no.15
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED MATERIALS
Volume
31
Number
15
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/66019
DOI
10.1002/adma.201807220
ISSN
0935-9648
Abstract
A novel imide-functionalized arene, di(fluorothienyl)thienothiophene diimide (f-FBTI2), featuring a fused backbone functionalized with electron-withdrawing F atoms, is designed, and the synthetic challenges associated with highly electron-deficient fluorinated imide are overcome. The incorporation of f-FBTI2 into polymer affords a high-performance n-type semiconductor f-FBTI2-T, which shows a reduced bandgap and lower-lying lowest unoccupied molecular orbital (LUMO) energy level than the polymer analog without F or with F-functionalization on the donor moiety. These optoelectronic properties reflect the distinctive advantages of fluorination of electron-deficient acceptors, yielding "stronger acceptors," which are desirable for n-type polymers. When used as a polymer acceptor in all-polymer solar cells, an excellent power conversion efficiency of 8.1% is achieved without any solvent additive or thermal treatment, which is the highest value reported for all-polymer solar cells except well-studied naphthalene diimide and perylene diimide-based n-type polymers. In addition, the solar cells show an energy loss of 0.53 eV, the smallest value reported to date for all-polymer solar cells with efficiency > 8%. These results demonstrate that fluorination of imide-functionalized arenes offers an effective approach for developing new electron-deficient building blocks with improved optoelectronic properties, and the emergence of f-FBTI2 will change the scenario in terms of developing n-type polymers for high-performance all-polymer solar cells.
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