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.
Reference Key
li2019878advanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Yongchun;Meng, Huifeng;Liu, Tao;Xiao, Yiqun;Tang, Zhonghai;Pang, Bo;Li, Yuqing;Xiang, Ying;Zhang, Guangye;Lu, Xinhui;Yu, Gui;Yan, He;Zhan, Chuanlang;Huang, Jianhua;Yao, Jiannian;
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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