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Issue 26, 2018
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High-performance ternary polymer solar cells using wide-bandgap biaxially extended octithiophene-based conjugated polymers

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Abstract

Ternary organic photovoltaics (OPVs) have recently attracted intense research attention since they have been proven as an effective approach to enhance device performance. We herein describe a new strategy to realize high-performance ternary OPVs by using biaxially extended octithiophene (8T)-based wide-bandgap (Eg) conjugated polymers as the third photoactive component. Owing to the π–π transition of the biaxially extended conjugated side-chains, such polymers exhibit intense absorption in the near-ultraviolet region, in addition to the original intra-charge transfer (ICT) feature arising from the main backbone, revealing a new molecular design for wide-Eg polymers. By further tailoring the polymer backbone with p-type moieties such as thiophene (T) or thienothiphene (TT), two wide-Eg (∼2.0 eV) polymers, P8TT and P8TTT, with absorption wavelengths below 650 nm, were prepared, showing high complementary absorption to the spectra of both the state-of-the-art fullerene-(PTB7-Th:PC71BM) and non-fullerene-based (PBDB-T:ITIC) bulk-heterojunction (BHJ) systems. By providing suitable energy levels, P8TTT was demonstrated to enhance the power conversion efficiency (PCE) of its derived fullerene- and non-fullerene-based ternary blends by 7.58% and 6.60%, respectively, with only a small loading amount (10 wt%). This study manifests a new perspective in wide-Eg material design for realizing efficient ternary BHJ systems.

Graphical abstract: High-performance ternary polymer solar cells using wide-bandgap biaxially extended octithiophene-based conjugated polymers

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Publication details

The article was received on 03 Apr 2018, accepted on 14 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8TC01542B
Citation: J. Mater. Chem. C, 2018,6, 6920-6928
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    High-performance ternary polymer solar cells using wide-bandgap biaxially extended octithiophene-based conjugated polymers

    C. Tsai, Y. Su, P. Lin, C. Shih, H. Wu, W. Chen and C. Chueh, J. Mater. Chem. C, 2018, 6, 6920
    DOI: 10.1039/C8TC01542B

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