期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701471
关键词
alkylthiolation; benzo[1,2-b:4,5-b']dithiophene; fluorination; polymer solar cells; synergistic effect
类别
资金
- Danish National Research Foundation (DNRF) for the Danish-Chinese Center for Organic-based Photovoltaic Cells with Morphological Control
- National Natural Science Foundation of China [51573205]
- Youth Innovation Promotion Association CAS [2016194]
- Sino-Danish Center for Education and Research (SDC)
Based on the most recently significant progress within the last one year in organic photovoltaic research from either alkylthiolation or fluorination on benzo[1,2-b: 4,5-b'] dithiophene moiety for high efficiency polymer solar cells (PSCs), two novel simultaneously fluorinated and alkylthiolated benzo[1,2-b: 4,5-b'] dithiophene (BDT)-based donor-acceptor (D-A) polymers, poly(4,8-bis(5'-((2''-ethylhexyl) thio)-4'-fluorothiophen-2'-yl) benzo[1,2-b: 4,5-b'] dithiophene-2,6-diyl)-alt-2'-ethylhexyl-3-fluorothieno[3,4-b] thiophene-2-carboxylate (PBDTT-SF-TT) and poly(4,8-bis(5'-((2''-ethylhexyl) thio)-4'-fluorothiophen-2'-yl) benzo[1,2-b: 4,5-b'] dithiophene-2,6-diyl)-alt-1,3bis( thiophen-2-yl)-5,7-bis(2-ethylhexyl) benzo[1,2-c: 4,5-c'] dithiophene-4,8-dione (PBDTT-SF-BDD), namely, via an advantageous and synthetically economic route for the key monomer are reported herein. Synergistic effects of fluorination and alkylthiolation on BDT moieties are discussed in detail, which is based on the superior balance between high V-oc and large J(sc) when PBDTTSF- TT/PC71BM and PBDTT-SF-BDD/ PC71BM solar cells present their high V-oc as 1.00 and 0.97 V (associated with their deep highest occupied molecular orbital level of -5.54 and -5.61 eV), a moderately high J(sc) of 14.79 and 14.70 mA cm(-2), and thus result a high power conversion efficiency of 9.07% and 9.72%, respectively. Meanwhile, for PBDTT-SF-TT, a very low energy loss of 0.59 eV is pronounced, leading to the promisingly high voltage, and furthermore performance study and morphological results declare an additive-free PSC from PBDTT-SF-TT, which is beneficial to practical applications.
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