Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1, Komaba, Tokyo 153-8904, Japan.
Phys Chem Chem Phys. 2013 Mar 7;15(9):3227-32. doi: 10.1039/c2cp43598e. Epub 2013 Jan 24.
A donor-acceptor type organic dye connected with a quinoidal thiophene as a π-conjugated chain, cyano-[5'-(4''-(N,N-dimethylamino)benzylidene)-5H-thiophen-2'-ylidene]acetic acid, was synthesized and applied to dye-sensitized solar cells (DSSCs). The absorption band of this quinoidal thiophene dye appeared at longer wavelengths than those of dyes with similar π-conjugation length, indicating the effective π-conjugation through the quinoidal structure. Although the excited state of the quinoidal thiophene dye is deactivated within several picoseconds even in solution, the DSSCs using the quinoidal thiophene dye showed incident photon to current conversion efficiency (IPCE) values of more than 90%, demonstrating the fast and efficient electron injection from the excited dye to TiO(2). By optimizing the fabrication conditions, the DSSC using this dye afforded a photoelectric conversion efficiency of 5.2%, without enlarging the molecular size.
一种供体-受体型有机染料，其通过醌式噻吩连接作为π共轭链，氰基-[5'-(4''-(N,N-二甲基氨基)亚苄基)-5H-噻吩-2'-亚基]乙酸，被合成并应用于染料敏化太阳能电池（DSSC）。与具有相似π共轭长度的染料相比，该醌式噻吩染料的吸收带出现在较长的波长处，表明通过醌式结构实现了有效的π共轭。尽管在溶液中，即使在几皮秒内，醌式噻吩染料的激发态也会失活，但使用醌式噻吩染料的 DSSC 显示出超过 90%的入射光子到电流转换效率（IPCE）值，证明了从激发态染料到 TiO(2)的快速和有效的电子注入。通过优化制备条件，使用该染料的 DSSC 提供了 5.2%的光电转换效率，而不会增大分子尺寸。
