Ethynyl thiophene-appended unsymmetrical zinc porphyrin sensitizers for dye-sensitized solar cells

P. Silviya Reeta, L. Giribabu*, S. Senthilarasu, Min Hung Hsu, D. Kishore Kumar, Hari M. Upadhyaya, Neil Robertson, Tracy Hewat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Four unsymmetrical porphyrins of A2B donor-π-acceptor type have been designed, synthesized, characterized and their photovoltaic properties explored. Polycyclic aromatic hydrocarbons (PAH), such as pyrene or fluorene, act as a donor, the porphyrin is the π-spacer, appended with an ethynyl thiophene linker, and either cyanoacrylic acid or malonic acid acts as the acceptor. All of the compounds were characterized by 1H NMR and mass spectrometry. UV-Vis absorption spectra and B or Soret (λex at 440 nm for the four sensitizers reported) band-excited fluorescence emission spectra were also obtained. The electrochemical properties suggest that the first oxidation is ring-centred, which is supported by in situ spectro-electrochemical and DFT computational studies. The synthesized porphyrins were applied in dye-sensitized solar cells (DSSCs). A conversion efficiency of up to 3.14%was realized for PYR-Por-MA under our experimental conditions.

Original languageEnglish
Pages (from-to)14165-14175
Number of pages11
JournalRSC Advances
Issue number27
Publication statusPublished - 2014


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