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

详细信息    查看全文

• 作者：Shih-Tang Huang ; Ying-Chan Hsu ; Yung-Sheng Yen ; Hsien Hsin Chou ; Jiann T. Lin ; Che-Wei Chang ; Chao-Ping Hsu ; Chiitang Tsai ; Da-Jong Yin
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：December 11, 2008
• 年：2008
• 卷：112
• 期：49
• 页码：19739-19747
• 全文大小：372K
• 年卷期：v.112,no.49(December 11, 2008)
• ISSN：1932-7455

文摘

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.