Organic Dyes Containing a Cyanovinyl Entity in the Spacer for Solar Cells Applications

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Title:	Organic Dyes Containing a Cyanovinyl Entity in the Spacer for Solar Cells Applications
Authors:	Huang, Shih-Tang Hsu, Ying-Chan Yen, Yung-Sheng Chou, Hsien Hsin Lin, Jiann T. Chang, Che-Wei Hsu, Chao-Ping Tsai, Chiitang Yin, Da-Jong
Contributors:	化學系
Keywords:	NANOCRYSTALLINE TIO2 FILMS CHARGE-TRANSFER SENSITIZERS HIGHLY EFFICIENT COUMARIN DYES SUBSTITUTED THIOPHENE ELECTRONIC-STRUCTURE ENERGY-CONVERSION EXCITED-STATES LIGHT CONJUGATION
Date:	2008
Issue Date:	2009-11-03 15:10:11 (UTC+8)
Abstract:	Series of dyes containing a cyanovinyl entity in the spacer have been developed and characterized. Dye-sensitized solar cells (DSSCs) using the dyes as the sensitizers exhibited good efficiencies ranging from 3.48-4.92%, which reached 45-70% with respect to that of an N719-based device fabricated under similar conditions. In general, better DSSC performances are observed with molecules having a shorter distance between the internal cyanovinyl entity and the amine donor. Computational analysis indicated that the cyanovinyl entity may behave as a charge trap, especially in the long molecules studied, where the cyanovinyl group is away from the electron-donating amine by two or more aromatic groups. A positive correlation is observed between the theoretically calculated product of oscillator strengths and the charge shift at the cyanoacrylic acid group and the measured short-circuit current in DSSCs. Therefore, it is likely that the charge-trapping in the cyanovinyl entity reduces the electronic interaction between the dye and the attached TiO2 and, therefore, compromises the DSSC performance.
Relation:	JOURNAL OF PHYSICAL CHEMISTRY C Volume: 112 Issue: 49 Pages: 19739-19747
Appears in Collections:	[Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles

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