期刊
CHEMISTRY OF MATERIALS
卷 32, 期 17, 页码 7309-7317出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c02133
关键词
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资金
- Ministry of Science and Technology of China [2019YFA0705900, 2017YFA0206600]
- National Natural Science Foundation of China [21875072]
- Fundamental Research Funds for Central Universities (South China University of Technology) [D2190310]
- Beijing National Laboratory for Molecular Sciences [BNLMS201901]
- Peiyang Scholar Program of Tianjin University
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-11]
Currently, high-performance organic solar cells (OSCs) are mainly composed of narrow band gap (NBG) nonfullerene acceptors and medium band gap (MBG) polymer donors, whereas the solar cells based on NBG polymer donors and MBG nonfullerene acceptors were much less successful. Herein, we report a new diketopyrrolopyrrole (DPP) polymer (PffBT-DPP) with a band gap of 1.33 eV for use in nonfullerene OSCs. When blended with a fullerene acceptor [6, 6]-phenyl C71 butyric acid methyl ester ([70]PCBM) and an MBG nonfullerene acceptor MeIC, the binary OSCs offered a power conversion efficiency (PCE) of 6.8 and 2.0%, respectively. Interestingly, a much higher PCE of 9.0% was achieved for the PffBT-DPP/[70]PCBM/MeIC ternary OSC, which is the sum of the two binary OSCs. The phase-separated morphology in this ternary OSC was characterized and correlated to the device performance. Moreover, the PCE of the ternary OSC is the best result for OSCs employing polymer donors with an optical band gap of <1.40 eV and nonfullerene acceptors. This work demonstrates the potential of constructing high-performance OSCs by employing NBG polymer donors and MBG nonfullerene acceptors.
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