期刊
ADVANCED MATERIALS
卷 31, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904585
关键词
all-polymer solar cell; B <- N bond; device performance; electron-deficient unit; polymer acceptor
类别
资金
- National Natural Science Foundation of China (NSFC) [51603076, 91433202]
- Graphene Powder & Composite Research Center of Fujian Province [2017H2001]
- Program for Innovative Research Team in Science and Technology in Fujian Province University
- Promotion Program for Young and Middle aged Teacher in Science and Technology Research of Huaqiao University [ZQN-PY405]
- Shenzhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
In the field of all-polymer solar cells (all-PSCs), all efficient polymer acceptors that exhibit efficiencies beyond 8% are based on either imide or dicyanoethylene. To boost the development of this promising solar cell type, creating novel electron-deficient units to build high-performance polymer acceptors is critical. A novel electron-deficient unit containing B <- N bonds, namely, BNIDT, is synthesized. Systematic investigation of BNIDT reveals desirable properties including good coplanarity, favorable single-crystal structure, narrowed bandgap and downshifted energy levels, and extended absorption profiles. By copolymerizing BNIDT with thiophene and 3,4-difluorothiophene, two novel conjugated polymers named BN-T and BN-2fT are developed, respectively. It is shown that these polymers possess wide absorption spectra covering 350-800 nm, low-lying energy levels, and ambipolar film-transistor characteristics. Using PBDB-T as the donor and BN-2fT as the acceptor, all-PSCs afford an encouraging efficiency of 8.78%, which is the highest for all-PSCs excluding the devices based on imide and dicyanoethylene-type acceptors. Considering that the structure of BNIDT is totally different from these classical units, this work opens up a new class of electron-deficient unit for constructing efficient polymer acceptors that can realize efficiencies beyond 8% for the first time.
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