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Issue 20, 2012
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Effect of polyphenyl-substituted ethylene end-capped groups in metal-free organic dyes on performance of dye-sensitized solar cells

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Abstract

A novel series of highly similar and comparable metal-free organic dyes have been designed and synthesized for dye-sensitized solar cells (DSSCs). The end-capped groups, namely, diphenylethylene, triphenylethylene, and tetraphenylethylene, have significant effects on the performance of DSSCs. The DSSC based on a triphenylethylene end-capped dye exhibits the highest power conversion efficiency (η) of 6.29%, whereas that based on a tetraphenylethylene end-capped dye has the highest open-circuit photovoltage (Voc) of 804 mV. The Voc of the DSSCs can be greatly improved upon the incorporation of a twisted non-planar aggregation-induced emission (AIE) moiety in the molecular structure of the dyes. The triphenylethylene group with a moderately twisted non-planar structure is found to be suitable for the improvement of the power conversion efficiency. The dyes exhibit an aggregation-caused emission quenching effect, i.e., the dyes do not emit light after being adsorbed on TiO2 films, although they contain aggregation-induced emission triphenylethylene and tetraphenylethylene moieties.

Graphical abstract: Effect of polyphenyl-substituted ethylene end-capped groups in metal-free organic dyes on performance of dye-sensitized solar cells

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Publication details

The article was received on 01 May 2012, accepted on 12 Jun 2012 and first published on 30 Jul 2012


Article type: Paper
DOI: 10.1039/C2RA20819A
Citation: RSC Adv., 2012,2, 7788-7797
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    Effect of polyphenyl-substituted ethylene end-capped groups in metal-free organic dyes on performance of dye-sensitized solar cells

    C. Chen, J. Liao, Z. Chi, B. Xu, X. Zhang, D. Kuang, Y. Zhang, S. Liu and J. Xu, RSC Adv., 2012, 2, 7788
    DOI: 10.1039/C2RA20819A

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