期刊
FRONTIERS IN CHEMISTRY
卷 6, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2018.00427
关键词
organic solar cell; non-fullerene; ladder-type structure; power conversion efficiency; bandgap
资金
- National Natural Science Foundation of China [U1605241, 51703226, 51561165011]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH032]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
Compared to the traditional fullerene derivatives, non-fullerene acceptors show more tunable absorption bands as well as adjustable energy levels which are favorable for further PCE enhancement of organic solar cells. In order to enhance light-harvesting property of dithienonaphthalene (DTN)-based acceptors, we designed and synthesized two novel non-fullerene acceptors (DTNIF and DTNSF) based on a ladder-type DTN donor core flanked with two different acceptor units. In combination with a benchmark wide bandgap copolymer (PBDB-T), the best performance device based on DTNIF displayed a high PCE of 8.73% with a short-circuit current (J(sc)) of 13.26 mA cm(-2) and a large fill factor (FF) of 72.77%. With a reduced bandgap of DTNSF, the corresponding best performance device showed an increased J(sc) of 14.49 mA cm(-2) although only a moderate PCE of 7.15% was achieved. These findings offer a molecular design strategy to control the bandgap of DIN-based non-fullerene acceptors with improved light-harvesting.
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