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Double B←N bridged bipyridine-containing polymer acceptors with enhanced electron mobility for all-polymer solar cells

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Abstract

With the aim of developing polymer electron acceptors with high electron mobilities (μe) for all-polymer solar cells (all-PSCs), we synthesized two novel polymer acceptors (P-BNBP-2f and P-BNBP-4f) containing alternate double B←N bridged bipyridine (BNBP) and 2,2′-(2,5-difluoro-1,4-phenylene)dithiophene/2,2′-(perfluoro-1,4-phenylene)dithiophene with extended conjugated structures. In comparison to P-BNBP-4f, P-BNBP-2f exhibits a small π–π stacking distance of 3.60 Å, leading to a sufficient electron mobility of 5.40 × 10−4 cm2 V−1 s−1 (measured by the space-charge-limited current method). This μe value is among the highest values of the conventional polymer acceptors, and is close to the hole mobilities (μh) of high-efficiency polymer donors. Moreover, P-BNBP-2f possesses high-lying LUMO/HOMO energy levels of −3.42/−5.81 eV, which match well with that of the reported excellent polymer donors of 2D-conjugated bithienyl-benzodithiophene-alt-fluorobenzotriazole (J61) and thienyl-substituted BDT with alkoxycarbonyl-substituted thieno[3,4-b]thiophene (PBDTTT-E-T). In addition, the blend films based on P-BNBP-2f exhibit intermixed morphologies, which are beneficial for efficient excition dissociation. As a result, all-PSCs with P-BNBP-2f as an electron acceptor work very well and exhibit a power conversion efficiency of 5.46%. These results demonstrate that high electron mobility of a polymer electron acceptor is very important to produce efficient all-PSCs.

Graphical abstract: Double B←N bridged bipyridine-containing polymer acceptors with enhanced electron mobility for all-polymer solar cells

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Publication details

The article was received on 28 Sep 2018, accepted on 23 Oct 2018 and first published on 25 Oct 2018


Article type: Research Article
DOI: 10.1039/C8QM00492G
Citation: Mater. Chem. Front., 2018, Advance Article
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    Double B←N bridged bipyridine-containing polymer acceptors with enhanced electron mobility for all-polymer solar cells

    X. Long, J. Yao, F. Cheng, C. Dou and Y. Xia, Mater. Chem. Front., 2018, Advance Article , DOI: 10.1039/C8QM00492G

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