title: Unsymmetric platinum(II) bis(aryleneethynylene) complexes as photosensitizers for dye-sensitized solar cells.
abstract: Four new unsymmetric platinum(II) bis(aryleneethynylene) derivatives have been designed and synthesized, which showed good light-harvesting capabilities for application as photosensitizers in dye-sensitized solar cells (DSSCs). The absorption, electrochemical, time-dependent density functional theory (TD-DFT), impedance spectroscopic, and photovoltaic properties of these platinum(II)-based sensitizers have been fully characterized. The optical and TD-DFT studies show that the incorporation of a strongly electron-donating group significantly enhances the absorption abilities of the complexes. The maximum absorption wavelength of these four organometallic dyes can be tuned by various structural modifications of the triphenylamine and/or thiophene electron donor, improving the light absorption range up to 650 nm. The photovoltaic performance of these dyes as photosensitizers in mesoporous TiO(2) solar cells was investigated, and a power conversion efficiency as high as 1.57% was achieved, with an open-circuit voltage of 0.59 V, short-circuit current density of 3.63 mA cm(-2), and fill factor of 0.73 under simulated AM 1.5G solar illumination.
authors.affiliation: Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P.R. China.
authors.forename: Feng-Rong
authors.initials: FR
authors.lastname: Dai
authors.forename: Yung-Chung
authors.initials: YC
authors.lastname: Chen
authors.forename: Lai-Fan
authors.initials: LF
authors.lastname: Lai
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Wu
authors.forename: Chao-Hua
authors.initials: CH
authors.lastname: Cui
authors.forename: Gui-Ping
authors.initials: GP
authors.lastname: Tan
authors.forename: Xing-Zhu
authors.initials: XZ
authors.lastname: Wang
authors.forename: Jiann-T'suen
authors.initials: JT
authors.lastname: Lin
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.forename: Wai-Yeung
authors.initials: WY
authors.lastname: Wong