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