Near-Infrared Absorbing Squaraine Dyes for Solar Cells: Relationship between Architecture and Performance
Near-Infrared Absorbing Squaraine Dyes for Solar Cells: Relationship between Architecture and Performance
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用于太阳能电池的近红外吸收方酸菁染料：结构与性能之间的关系
DOI：
10.1021/jp300155g
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发表时间：
2012-04-26
影响因子：
3.7
通讯作者：
Xu, Hongyao
中科院分区：
文献类型：
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作者：
Yan, Zhengquan;Guang, Shanyi;Xu, Hongyao
为了进一步研究染料结构对染料敏化太阳能电池（DSSC）性能的影响，设计、制备了几种不同共轭度的喹啉类方酸染料（4a、4 b和4c），并将其作为敏化剂应用于太阳能电池中.光物理和光化学研究表明，光电转换效率（η）受分子结构的显著影响;即，4c的π电子共轭度最大，极性最强，锚定能力最强，比4 b高2倍，比4a高6倍。也就是说，具有更小光学带隙和更高摩尔吸收系数的分子将具有更好的光捕获特性和更高的转换效率。此外，4 b和4c中与π-π电子跃迁相关的所有激发态轨道都在锚定基团上离域，确保了强的电子跃迁。
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 (η) are significantly affected by molecular structures; i.e., η of 4c with the strongest polarity and anchoring ability and the longest π 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 π–π electron transition both in 4b and 4c are delocalized over the anchoring groups, ensuring a strong electroni...