Development of D–π–Cat fluorescent dyes with a catechol group for dye-sensitized solar cells based on dye-to-TiO2 charge transfer
作者:Yousuke Ooyama、Takehiro Yamada、Takuya Fujita、Yutaka Harima、Joji Ohshita
DOI:10.1039/c4ta01286k
日期:——
D–π–Cat fluorescent dyes YM-1 and YM-2 with a diphenylamine moiety as the electron-donating group, a catechol (Cat) unit as the anchoring group and fluorene or carbazole as the π-conjugated system were designed and developed as a photosensitizer for type-II dye-sensitized solar cells (DSSCs), which have a direct electron-injection pathway from the dye to the conduction band (CB) of the TiO2 electrode
设计并开发了以二苯胺部分为供电子基团,邻苯二酚(Cat)单元为锚定基团和芴或咔唑为π-共轭体系的D-π-Cat荧光染料YM-1和YM-2。对于II型染料敏化太阳能电池(DSSC),其具有从所述染料到TiO 2的导带(CB)的直接电子注入通路的光敏剂2通过的染料与二氧化钛光激发电极2电荷转移(DTCT)频段。此外,不仅要了解D–π–Cat染料的分子结构对DTCT带的外观和电子注入机理的影响,而且还要研究D–π–Cat染料的DTCT特性的影响。合成了DSSCs光伏性能的猫染料,还合成了以咔唑-对噻吩为π-共轭体系的D-π-Cat荧光染料YM-3。发现D–π–Cat染料在可见光区域具有良好的光收集效率(LHE),这是因为与TiO 2结合时与DTCT相对应的吸收带较宽。对应于基于YM-1和YM-2的DSSC的DTCT波段的入射光子-电流转换效率(IPCE)比YM-3高。这项工作表明,通过在Cat部