Journal
ADVANCED MATERIALS
Volume 30, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704546
Keywords
large area; nonfullerene polymer solar cells; thicker active layer; wide-bandgap polymer donor; without extra treatments
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51422306, 51503135, 51573120, 91633301]
- Jiangsu Provincial Natural Science Foundation [BK20150332]
- U.S. Office of Naval Research [N00014-15-1-2244]
- DOE, Office of Science, and Office of Basic Energy Sciences
- Ministry of Education Academic Research Fund [RG101/15, RG173/16, MOE2014-T2-1-044, MOE2015-T2-2-015, MOE2016-T2-1-034]
- Singapore National Research Foundation through the Competitive Research Program [NRF-CRP14-2014]
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In this work, a nonfullerene polymer solar cell (PSC) based on a wide bandgap polymer donor PM6 containing fluorinated thienyl benzodithiophene (BDT-2F) unit and a narrow bandgap small molecule acceptor 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) is developed. In addition to matched energy levels and complementary absorption spectrum with IDIC, PM6 possesses high crystallinity and strong - stacking alignment, which are favorable to charge carrier transport and hence suppress recombination in devices. As a result, the PM6:IDIC-based PSCs without extra treatments show an outstanding power conversion efficiency (PCE) of 11.9%, which is the record value for the as-cast PSC devices reported in the literature to date. Moreover, the device performances are insensitive to the active layer thickness (approximate to 95-255 nm) and device area (0.20-0.81 cm(2)) with PCEs of over 11%. Besides, the PM6:IDIC-based flexible PSCs with a large device area of 1.25 cm(2) exhibit a high PCE of 6.54%. These results indicate that the PM6:IDIC blend is a promising candidate for future roll-to-roll mass manufacturing and practical application of highly efficient PSCs.
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