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Issue 22, 2019
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Azulenocyanines immobilized on graphene; on the way to panchromatic absorption and efficient DSSC blocking layers

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Abstract

Herein, a novel electron donor–acceptor hybrid consisting of a NIR absorbing azulenocyanine as an electron donor and few-layer graphene as an electron acceptor was prepared. The extended aromatic core of azulenocyanine (1) assists in the exfoliation of graphite and allows the formation of a very high-quality few-layer graphene azulenocyanine hybrid system (2). The formation of a stable azulenocyanine/graphene hybrid was verified by means of an arsenal of spectroscopic and microscopic techniques. Notable is the fact that the absorption spectrum recorded for 1 and likewise that for 2 covers large portions of the solar spectrum, that is, from the UV through the visible to the NIR region. In light of the latter, we incorporated 1 as well as 2 as a photosensitizer in dye sensitized solar cells (DSSCs) and probed their light harvesting. Besides an increase in the photovoltaic conversion efficiency we focused on the stability of DSSCs by preventing charge recombination between FTO and the liquid electrolyte. We used 2 as a blocking layer and in comparison with a TiCl4 pretreated blocking layer a superior conversion efficiency was realized.

Graphical abstract: Azulenocyanines immobilized on graphene; on the way to panchromatic absorption and efficient DSSC blocking layers

  • This article is part of the themed collection: Nanocarbons
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Publication details

The article was received on 16 Mar 2019, accepted on 10 May 2019 and first published on 13 May 2019


Article type: Paper
DOI: 10.1039/C9NR02300C
Nanoscale, 2019,11, 10709-10715

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    Azulenocyanines immobilized on graphene; on the way to panchromatic absorption and efficient DSSC blocking layers

    M. Volland, A. Lennert, A. Roth, M. Ince, T. Torres and D. M. Guldi, Nanoscale, 2019, 11, 10709
    DOI: 10.1039/C9NR02300C

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