A new co-sensitization method employing D-pi-A dye with pyridyl group and D-pi-Cat dye with catechol unit for dye-sensitized solar cells

作者：Ooyama Yousuke^*; Uenaka Koji; Kanda Masahiro; Yamada Takehiro; Shibayama Naoyuki; Ohshita Joji

来源：Dyes and Pigments, 2015, 122: 40-45.

DOI：10.1016/j.dyepig.2015.06.009

• Dye-sensitized solar cells
• Co-sensitization method
• D-pi-A dye sensitizer
• Pyridyl group
• Catechol unit
• Dye-to-TiO2 charge transfer

To provide a new co-sensitization approach in dye-sensitized solar cells, we have developed a co-sensitization method employing D-pi-A dye sensitizer with pyridyl group and type-II D-pi-Cat dye sensitizer with catechol unit. It was found that the D-pi-A dye sensitizer with pyridyl group and the type-II D-pi-Cat dye sensitizer are adsorbed on the co-adsorbed TiO2 film through the coordinate bonding at the Lewis acid sites and the bidentate linkage at the Bronsted acid site on the TiO2 surface, respectively. This work indicates that a convenient co-sensitization of two different dyes on the TiO2 electrode without the competitive adsorption has been achieved successfully by utilizing the site-selective adsorption behaviour of the D-pi-dye sensitizer with pyridyl group and the type-II D-pi-Cat dye sensitizer, resulting in enhancement of dye coverage on the TiO2 electrode.

• 出版日期2015-11