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Issue 16, 2012
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A new family of A2B2 type porphyrin derivatives: synthesis, physicochemical characterization and their application in dye-sensitized solar cells

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Abstract

A new series of A2B2 type porphyrins, i.e. free base P1 and Zn-complex P2, have been synthesized and characterized as photosensitizers for dye sensitized solar cells (DSSCs). These dye molecules contain a porphyrin unit as a π-spacer, two N,N′-dimethylphenyl groups as electron donors and two phenylcarboxylic acid moieties as anchoring groups yielding push push–pull pull type porphyrins. The photophysical as well as electrochemical properties of the two dyes (P1 and P2) were investigated by UV-Vis, fluorescence spectroscopy and cyclic voltammetry. The DFT results showed that the HOMO is located on the donor group and the LUMO is located on the anchoring carboxylate group indicating their suitability for fabrication in DSSCs. Under photovoltaic measurements, overall PCEs of 3.80% and 4.90% were achieved with the DSSCs based on P1 and P2 dyes, respectively. The overall PCEs have been further improved up to 4.83% and 6.07%, with P1 and P2 dyes when CDCA co-adsorbent was added to the dye solution. The electrochemical impedance data indicate that the electron lifetime was improved by the coadsorption of CDCA, which was attributed to the improvement in both Voc and Jsc. The increase in Jsc has also been attributed to the reduction of the back reaction, i.e. the recombination of electrons with tri-iodide ions.

Graphical abstract: A new family of A2B2 type porphyrin derivatives: synthesis, physicochemical characterization and their application in dye-sensitized solar cells

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Publication details

The article was received on 24 Oct 2011, accepted on 22 Jan 2012 and first published on 15 Mar 2012


Article type: Paper
DOI: 10.1039/C2JM15420J
Citation: J. Mater. Chem., 2012,22, 8092-8102
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    A new family of A2B2 type porphyrin derivatives: synthesis, physicochemical characterization and their application in dye-sensitized solar cells

    M. K. Panda, G. D. Sharma, K. R. Justin Thomas and A. G. Coutsolelos, J. Mater. Chem., 2012, 22, 8092
    DOI: 10.1039/C2JM15420J

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