Functionalized Alkynylplatinum(II) Polypyridyl Complexes for Use as Sensitizers in Dye‐Sensitized Solar Cells |
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| Authors: | Eric Chi‐Ho Kwok Dr. Mei‐Yee Chan Dr. Keith Man‐Chung Wong Dr. Wai Han Lam Prof. Dr. Vivian Wing‐Wah Yam |
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| Affiliation: | Institute of Molecular Functional Materials, Areas of Excellence Scheme, University Grants Committee (Hong Kong)), Department of Chemistry and HKU‐CAS Joint Laboratory of New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong (P.R. China), Fax: (+852)?2857‐1586 |
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| Abstract: | A series of platinum(II) alkynyl‐based sensitizers has been synthesized and found to show light‐to‐electricity conversion properties. These dyes were developed as sensitizers for the application in nanocrystalline TiO2 dye‐sensitized solar cells (DSSCs). Their photophysical and electrochemical properties were studied. The excited‐state property was probed using nanosecond transient absorption spectroscopy, which showed the formation of a charge‐separated state that arises from the intramolecular photoinduced charge transfer from the platinum(II) alkynylbithienylbenzothiadiazole moiety (donor) to the polypyridyl ligand (acceptor). A lifetime of 3.4 μs was observed for the charge‐separated state. A dye‐sensitized solar cell based on one of the complexes showed a short‐circuit photocurrent of 7.12 mA cm?2, an open circuit voltage of 780 mV, and a fill factor of 0.65, thus giving an overall power conversion efficiency of 3.6 %. |
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| Keywords: | density functional calculations dyes/pigments energy conversion platinum sensitizers |
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