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Issue 15, 2018
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Impact of helical organization on the photovoltaic properties of oligothiophene supramolecular polymers

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Abstract

Helical self-assembly of functional π-conjugated molecules offers unique photochemical and electronic properties in the spectroscopic level, but there are only a few examples that demonstrate their positive impact on the optoelectronic device level. Here, we demonstrate that hydrogen-bonded tapelike supramolecular polymers of a barbiturated oligo(alkylthiophene) show notable improvement in their photovoltaic properties upon organizing into helical nanofibers. A tapelike hydrogen-bonded supramolecular array of barbiturated oligo(butylthiophene) molecules was directly visualized by STM at a liquid–solid interface. TEM, AFM and XRD revealed that the tapelike supramolecular polymers further organize into helical nanofibers in solution and bulk states. Bulk heterojunction solar cells of the helical nanofibers and soluble fullerene showed a power conversion efficiency of 4.5%, which is markedly high compared to that of the regioisomer of butyl chains organizing into 3D lamellar agglomerates.

Graphical abstract: Impact of helical organization on the photovoltaic properties of oligothiophene supramolecular polymers

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Publication details

The article was received on 29 Nov 2017, accepted on 11 Mar 2018 and first published on 12 Mar 2018


Article type: Edge Article
DOI: 10.1039/C7SC05093C
Citation: Chem. Sci., 2018,9, 3638-3643
  • Open access: Creative Commons BY license
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    Impact of helical organization on the photovoltaic properties of oligothiophene supramolecular polymers

    H. Ouchi, T. Kizaki, M. Yamato, X. Lin, N. Hoshi, F. Silly, T. Kajitani, T. Fukushima, K. Nakayama and S. Yagai, Chem. Sci., 2018, 9, 3638
    DOI: 10.1039/C7SC05093C

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