title: Functionalized alkynylplatinum(II) polypyridyl complexes for use as sensitizers in dye-sensitized solar cells.
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 TiO(2) 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%.
authors.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.
authors.forename: Eric Chi-Ho
authors.initials: EC
authors.lastname: Kwok
authors.forename: Mei-Yee
authors.initials: MY
authors.lastname: Chan
authors.forename: Keith Man-Chung
authors.initials: KM
authors.lastname: Wong
authors.forename: Wai Han
authors.initials: WH
authors.lastname: Lam
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam