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Design of Asymmetric Benzodithiophene based Wide Band-gap Conjugated Polymers toward Efficient Polymer Solar Cells Promoted by Low Boiling Point Additive

Abstract

In this work, we reported two wide band-gap donor-acceptor (D-A) photovoltaic materials based on asymmetric benzodithiophene units with bare phenyl or alkoxyl chain modified phenyl group as one of the substitutions. The optical band-gaps of two polymers are both identified above 1.80 eV. P2 (with side chain in phenyl group) reveals slightly red-shifted film absorption spectra than polymer P1 attached with bare phenyl group, partly attributed to the better molecular conformations and intermolecular interactions. Polymer solar cells with different acceptor materials are fabricated to systematically evaluate the photovoltaic properties of the two polymers. The results show that P2 based fullerene and fullerene-free solar cells both show superior photovoltaic performance than devices of P1, mainly attributed to the more favorable heterojuction morphologies and more balanced charge transport. P2 based PSCs with PC71BM as the acceptor account for an enhanced efficiency (8.58%) than that of P1 (7.04%). Notably, low boiling point toluene was reported as the effective additive for the first time to optimize the photovoltaic performance of fullerene-free polymer solar cells. The best efficiency of P2/ITIC based devices reached exceeding 9%, with Voc of 0.90 V, Jsc of 16.70 mA cm-2, and FF of 0.603, suggesting the great potential of low boiling point solvent as the additive toward efficient fullerene-free polymer solar cells.

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Publication details

The article was received on 10 Jan 2018, accepted on 13 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C8TC00148K
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Design of Asymmetric Benzodithiophene based Wide Band-gap Conjugated Polymers toward Efficient Polymer Solar Cells Promoted by Low Boiling Point Additive

    Y. Li, L. Duan, D. Liu, W. Chen, X. Bao, H. Zhen, H. Liu and R. Yang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00148K

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