Near-Infrared Absorbing Squaraine Dyes for Solar Cells: Relationship between Architecture and Performance
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- 作者：Zhengquan Yan ; Shanyi Guang ; Xinyan Su ; Hongyao Xu
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：April 26, 2012
- 年：2012
- 卷：116
- 期：16
- 页码：8894-8900
- 全文大小：338K
- 年卷期：v.116,no.16(April 26, 2012)
- ISSN：1932-7455
文摘
To further investigate the influence of dye architecture on dye-sensitized solar cell (DSSC) performance, some near-infrared absorbing quinoline-based squaraine dyes (4a, 4b, and 4c) with different conjugated degrees carrying carboxylic or sulfonic groups as anchoring groups were designed, prepared, and applied as sensitizers in solar cells. The photophysical and photochemical studies showed that photoelectric conversion efficiencies (畏) are significantly affected by molecular structures; i.e., 畏 of 4c with the strongest polarity and anchoring ability and the longest 蟺 electron conjugated degree was two times more than that of 4b and six times more than that of 4a. That is, the molecules with smaller optical band gap and higher molar absorption coefficient will possess better light-harvesting properties and enhanced conversion efficiency. Furthermore, all excited state orbitals relevant for the 蟺鈥撓€ electron transition both in 4b and 4c are delocalized over the anchoring groups, ensuring a strong electronic coupling to the conduction band of TiO2 and hence a fast electron transfer.