Molecular Dyads Comprising Metalloporphyrin and Alkynylplatinum(II) Polypyridine Terminal Groups for Use as a Sensitizer in Dye‐Sensitized Solar Cells |
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| Authors: | Eric Chi‐Ho Kwok Dr. Mei‐Yee Chan Dr. Keith Man‐Chung Wong Prof. Dr. Vivian Wing‐Wah Yam |
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| Affiliation: | Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (China), Fax: (+852)?2857‐1586 |
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| Abstract: | A new class of molecular dyads comprising metalloporphyrin‐linked alkynylplatinum(II) polypyridine complexes with carboxylic acids as anchoring groups has been designed and synthesized. These complexes can sensitize nanocrystalline TiO2 in dye‐sensitized solar cell (DSSC) studies. The photophysical, electrochemical, and luminescence properties of the complexes were studied and their excited‐state properties were investigated by nanosecond transient absorption spectroscopy, with the charge‐separated [Por.??{(C?C)Pt(tBu3tpy)}.+] state observed upon excitation. Excited‐state redox potentials were determined; the electrochemical data supports the capability of the complexes to inject an electron into the conduction band of TiO2. The complexes sensitize nanocrystalline TiO2 and exhibited photovoltaic properties, as characterized by current–voltage measurements under illumination of air mass 1.5 G sunlight (100 mWcm?2). A DSSC based on one of the complexes showed a short‐circuit photocurrent of 10.1 mAcm?2, an open‐circuit voltage of 0.64 V, and a fill factor of 0.52, giving an overall power conversion efficiency of 3.4 %. |
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| Keywords: | dyads dye‐sensitized solar cells metalloporphyrins platinum polypyridine |
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