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High-Performance Ternary Polymer Solar Cells Using Wide Bandgap Biaxially-Extended Octithiophene-Based Conjugated Polymers

Abstract

Ternary organic photovoltaic (OPV) has recently attracted intense research attention since it has been proven as an effective approach to enhance the 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 conjugated biaxially-extended 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 the p-type moieties such as thiophene (T) or thienothiphene (TT), wide Eg (~2.0 eV) polymers, P8TT and P8TTT, with absorption wavelengths below 650 nm were prepared, showing very complementary absorption to the spectra of both state-of-the-art fullerene- (PTB7-Th:PC71BM) and non-fullerene-based (PBDB-T:ITIC) bulk-heterojunction (BHJ) systems. As providing suitable energy levels, P8TTT was demonstrated to respectively enable 7.58% and 6.60% enhancement in power conversion efficiency (PCE) for its derived fullerene- and non-fullerene-based ternary blends with only a small adding amount (10 wt%). This study manifests a new perspective in wide Eg material design for realizing efficient ternary BHJ systems.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8TC01542B

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