Thermally stable, highly efficient, ultraflexible organic photovoltaics

Xiaomin Xu, Kenjiro Fukuda, Akchheta Karki, Sungjun Park, Hiroki Kimura, Hiroaki Jinno, Nobuhiro Watanabe, Shuhei Yamamoto, Satoru Shimomura, Daisuke Kitazawa, Tomoyuki Yokota, Shinjiro Umezu, Thuc Quyen Nguyen, Takao Someya

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Flexible photovoltaics with extreme mechanical compliance present appealing possibilities to power Internet of Things (IoT) sensors and wearable electronic devices. Although improvement in thermal stability is essential, simultaneous achievement of high power conversion efficiency (PCE) and thermal stability in flexible organic photovoltaics (OPVs) remains challenging due to the difficulties in maintaining an optimal microstructure of the active layer under thermal stress. The insufficient thermal capability of a plastic substrate and the environmental influences cannot be fully expelled by ultrathin barrier coatings. Here, we have successfully fabricated ultraflexible OPVs with initial efficiencies of up to 10% that can endure temperatures of over 100 °C, maintaining 80% of the initial efficiency under accelerated testing conditions for over 500 hours in air. Particularly, we introduce a low-bandgap poly(benzodithiophene-cothieno[3,4-b]thiophene) (PBDTTT) donor polymer that forms a sturdy microstructure when blended with a fullerene acceptor. We demonstrate a feasible way to adhere ultraflexible OPVs onto textiles through a hot-melt process without causing severe performance degradation.

    Original languageEnglish
    Pages (from-to)4589-4594
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume115
    Issue number18
    DOIs
    Publication statusPublished - 2018 May 1

    Fingerprint

    Thermodynamic stability
    Fullerenes
    Thiophenes
    Microstructure
    Thermal stress
    Conversion efficiency
    Textiles
    Polymers
    Energy gap
    Plastics
    Degradation
    Coatings
    Sensors
    Testing
    Substrates
    Air
    Temperature
    Compliance
    Internet of things
    Wearable technology

    Keywords

    • Organic photovoltaics
    • Power conversional efficiency
    • Thermal stability
    • Ultraflexibility

    ASJC Scopus subject areas

    • General

    Cite this

    Thermally stable, highly efficient, ultraflexible organic photovoltaics. / Xu, Xiaomin; Fukuda, Kenjiro; Karki, Akchheta; Park, Sungjun; Kimura, Hiroki; Jinno, Hiroaki; Watanabe, Nobuhiro; Yamamoto, Shuhei; Shimomura, Satoru; Kitazawa, Daisuke; Yokota, Tomoyuki; Umezu, Shinjiro; Nguyen, Thuc Quyen; Someya, Takao.

    In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 115, No. 18, 01.05.2018, p. 4589-4594.

    Research output: Contribution to journalArticle

    Xu, X, Fukuda, K, Karki, A, Park, S, Kimura, H, Jinno, H, Watanabe, N, Yamamoto, S, Shimomura, S, Kitazawa, D, Yokota, T, Umezu, S, Nguyen, TQ & Someya, T 2018, 'Thermally stable, highly efficient, ultraflexible organic photovoltaics', Proceedings of the National Academy of Sciences of the United States of America, vol. 115, no. 18, pp. 4589-4594. https://doi.org/10.1073/pnas.1801187115
    Xu, Xiaomin ; Fukuda, Kenjiro ; Karki, Akchheta ; Park, Sungjun ; Kimura, Hiroki ; Jinno, Hiroaki ; Watanabe, Nobuhiro ; Yamamoto, Shuhei ; Shimomura, Satoru ; Kitazawa, Daisuke ; Yokota, Tomoyuki ; Umezu, Shinjiro ; Nguyen, Thuc Quyen ; Someya, Takao. / Thermally stable, highly efficient, ultraflexible organic photovoltaics. In: Proceedings of the National Academy of Sciences of the United States of America. 2018 ; Vol. 115, No. 18. pp. 4589-4594.
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