Unsymmetric Platinum(II) Bis(aryleneethynylene) Complexes as Photosensitizers for Dye‐Sensitized Solar Cells |
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| Authors: | Dr. Feng‐Rong Dai Dr. Yung‐Chung Chen Lai‐Fan Lai Dr. Wen‐Jun Wu Chao‐Hua Cui Gui‐Ping Tan Xing‐Zhu Wang Prof. Jiann‐T'suen Lin Prof. He Tian Prof. Wai‐Yeung Wong |
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| Affiliation: | 1. 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), Fax: (+86)?852‐34117348;2. Institute of Chemistry, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 115 (Taiwan), Fax: (+886)?2‐27831237;3. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, Shanghai, 200237 (P.R. China), Fax: (+86)?21‐64252288 |
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| 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 TiO2 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. |
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| Keywords: | acetylide dye‐sensitized solar cells photosensitizers photovoltaics platinum |
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