8.78% Efficient All-Polymer Solar Cells Enabled by Polymer Acceptors Based on a B←N Embedded Electron-Deficient Unit.

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ID: 47429
2019
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Abstract
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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Authors Yongchun Li, Huifeng Meng, Tao Liu, Yiqun Xiao, Zhonghai Tang, Bo Pang, Yuqing Li, Ying Xiang, Guangye Zhang, Xinhui Lu, Gui Yu, He Yan, Chuanlang Zhan, Jianhua Huang, Jiannian Yao
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Journal advanced materials (deerfield beach, fla)
Year 2019
DOI
10.1002/adma.201904585
URL
Keywords
b←n bond all-polymer solar cell device performance electron-deficient unit polymer acceptor

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