Journal
ORGANIC ELECTRONICS
Volume 37, Issue -, Pages 287-293Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2016.07.007
Keywords
Polymer solar cells; Phenyl substituted benzodithiophene; Tetrafluoridequinoxaline; Photovoltaic properties
Funding
- National Natural Science Foundation of China [51173206]
- Project of Innovation-driven Plan in Central South University, China [2016CX035]
- State Key Laboratory of Powder Metallurgy, Central South University, China
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts023]
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A series of new copolymers from tetrafluoridequinoxaline (ffQx) and three distinctive phenyl (alkoxy-1-meta-fluorophenyl, alkoxyphenyl and alkylthiophenyl) substituted benzodithiophene (BDT), namely, PffQx-m-fPO, PffQx-PO and PffQx-PS, were designed and synthesized. Photophysical properties, charge mobilities and morphologies of the three polymers have been intensively investigated. Benefitted from the effects of phenyl and fluorine substituents on the backbone, all the polymers possess deep the highest occupied molecular orbital (HOMO) levels. In particular, PffQx-PS has a lower bimolecular recombination and deeper HOMO energy level, which contributes to the higher fill factor (FF, ca. 70%) and higher open-circuit voltage (V-oc, ca. 0.93 V) of the polymer solar cells (PSCs) with the polymer as donor and PC71BM as acceptor. All the PSCs with the ffQx-based polymers as donor exhibited VocS higher than 0.9 V and power conversion efficiencies over 7% (7.0% for PffQx-m-fPO, 7.4% for PffQx-PO and 8.0% for PffQx-PS). (C) 2016 Elsevier B.V. All rights reserved.
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