期刊
SOLAR RRL
卷 4, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201900353
关键词
fullerene-free; nonfullerene acceptors; organic solar cells; polymer solar cells; ternary solar cells
资金
- National Natural Science Foundation of China (NSFC) [91433202, 21773262, 21327805]
- Chinese Academy of Sciences (CAS) [XDB12010200]
- Ministry of science and technology [2016YFA0200700]
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DEAC02-05CH11231]
- NSFC/RGC Joint Research Scheme [N_CUHK418/17]
Herein, an A-D-A-type nonfullerene acceptor (named IDTS-4F) with an alkyl thiophenyl side chain and dimethoxy thiophene bridging unit is reported. The use of an alkyl thiophenyl group is important, as the insertion of sulfur atoms can slightly downshift the highest occupied molecular orbital (HOMO) level of the molecule and allows IDTS-4F to match with state-of-the-art donor polymer PM6 (or PM7). Compared with conventional nonfullerene acceptors, IT-4F, the IDTS-4F molecule, has a smaller optical bandgap and higher lowest unoccupied molecular orbital (LUMO) level, which are beneficial to increase the V-oc and J(sc) of the devices. Nonfullerene organic solar cell devices are fabricated using IDTS-4F. Although the binary device based on IDTS-4F exhibits a lower fill factor (FF, 70%), the ternary device by incorporating 0.2 of IDTS-4F and 0.8 of IT-4F (with PM6 as the donor polymer) can simultaneously achieve a higher V-oc and J(sc), while maintaining the high FF (77%) of IT-4F based system. Morphology characterizations indicate the formation of homogeneous film morphology, the large increase in phase purity and crystallinity, and the reduction in domain size upon addition of crystalline IDTS-4F, while the electron/hole mobilities and recombination losses of the IT-4F system are both maintained.
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