期刊
ORGANIC ELECTRONICS
卷 45, 期 -, 页码 42-48出版社
ELSEVIER
DOI: 10.1016/j.orgel.2017.02.029
关键词
Non-fullerene polymer solar cells; TBF-based polymers; Bandgap; n-type small molecule acceptor
资金
- NSFC [51673205]
- Project of innovation-driven Plan in Central South University, China [2016CX035]
- State Key Laboratory of Powder Metallurgy, Central South University, Chang Sha, China
To further investigate non-fullerene polymer solar cells based-thieno[2,3-f]benzofuran (TBF) polymers, we designed and synthesized two medium bandgap TBF-based polymers, namely TBF-BDD and TBF-BT, containing alkoxyphenyl substituted TBF electron-donor unit, 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo-[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) and 4,7-di(thiophen-2-yl)-5,6-dioctyloxybenzo[c][1,2,5]thiadiazole (BT) electron-acceptor segment, respectively. When blended with ITIC (a n-type small molecule acceptor), two polymer:ITIC blends possess better complementary absorption than the absorption with PC71BM. The properties, including charge mobilities, and morphologies have been intensively investigated. The polymer solar cells based on TBF-BDD:ITIC and TBF-BT:ITIC (1:1,w/w) exhibited promising power conversion efficiencies (PCEs) of 7.13% and 7.03%, respectively, under the illumination of AM 1.5 G, 100 mW/cm(2), which are higher in comparison with fullerene-based devices. Up to now, these PCEs are the highest among TBF-based polymer photovoltaic devices. (C) 2017 Elsevier B.V. All rights reserved.
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