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Issue 9, 2012
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Phenothiazine derivatives as organic sensitizers for highly efficient dye-sensitized solar cells

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Abstract

A series of organic dyes containing a phenothiazine central unit were synthesized and were used effectively in the fabrication of dye-sensitized solar cells (DSSCs). A cyanoacrylate moiety was added at the C(3) position of the phenothiazine as an electron acceptor, and a triarylamine moiety was attached at the C(7) position as an electron donor. The DSSCs made with these dyes displayed remarkable quantum efficiency, ranging from 4.2–6.2% under an AM 1.5 solar condition (100 mW cm−2). A variety of substituents, i.e., methyl, hexyl and triphenylamino groups, were added at the N(10) of phenothiazine in order to optimize the incident photon-to-current conversion efficiency. Along the main chromophore a thiophenylene group was inserted at different positions to examine its influence on the properties of devices. The best performance was found in compound NSPt-C6, in which a hexyl group was attached at the N(10) of phenothiazine and a thiophenylene at the C(7) position. It displayed a short-circuit current (Jsc) of 14.42 mA cm−2, an open-circuit voltage (Voc) of 0.69 V, and a fill factor (ff) of 0.63, corresponding to an overall conversion efficiency of 6.22%. Their photophysical properties were analyzed with the aid of a time-dependent density functional theory (TDDFT) model with the B3LYP functional. Their photovoltaic behavior was further elucidated by the electrochemical impedance spectroscopy.

Graphical abstract: Phenothiazine derivatives as organic sensitizers for highly efficient dye-sensitized solar cells

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Publication details

The article was received on 15 Aug 2011, accepted on 18 Dec 2011 and first published on 25 Jan 2012


Article type: Paper
DOI: 10.1039/C2JM13961H
Citation: J. Mater. Chem., 2012,22, 4040-4049
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    Phenothiazine derivatives as organic sensitizers for highly efficient dye-sensitized solar cells

    C. Yang, Y. J. Chang, M. Watanabe, Y. Hon and T. J. Chow, J. Mater. Chem., 2012, 22, 4040
    DOI: 10.1039/C2JM13961H

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