Journal
SOLAR RRL
Volume 1, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201700020
Keywords
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Funding
- Ministry of science and technology [2016YFA0200700]
- National Natural Science Foundation of China (NSFC) [51422306, 51503135, 51573120, 91333204, 21504066, 21534003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Provincial Natural Science Foundation [BK20150332]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJB430027]
- Ministry of Science and Technology of China (973 project) [2014CB643501]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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A new wide bandgap conjugated polymer, PFBZ, based on fluorination thienyl conjugated benzodithiophene (BDT-2F) as a donor unit and difluorinated benzotriazole (BTz-2F) as an acceptor unit, was synthesized for non-fullerene polymer solar cells (PSCs) application. Compared with the analogue based on non-fluorinated BDT unit (PBZ), PFBZ shows a lower HOMO level, a similar wide optical bandgap with a higher extinction coefficient, and a slightly higher hole mobility. As a result, without any extra treatments, the PFBZ: ITIC-based device exhibits a higher PCE of 10.4% with V-oc of 0.89 V, J(sc) of 18.8 mA cm(-2), and FF of 62% in comparison with the PCE of 8.0% with V-oc of 0.79 V, J(sc) of 17.2 mA cm(-2), and FF of 59% for PBZ: ITIC-based devices. Furthermore, the photovoltaic performance of the PFBZ: ITIC-based devices are relatively insensitive to the thickness of the active layer and the PCE still remains 8.9% with a thickness of up to 200 nm. In addition, the PFBZ: ITIC-based devices exhibit high tolerance to the thermal annealing, and still show a high PCE of 9.3% with annealing at 150 degrees C for 1 h. These results indicate that PFBZ is a promising candidate for the large scale manufacturing and practical application of high-efficiency PSCs.
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