Non-alkylated BODIPY dye YHO-1 and hexa-alkylated BODIPY dye YHO-2, which have a diphenylamino-carbazole moiety as an electron-donating group at the 8-position on the BODIPY core and a carboxyhexyl group as an anchoring group on the carbazole ring, were designed and developed as photosensitizers for dye-sensitized solar cells (DSSCs). From the molecular structures of YHO-1 and YHO-2, when the two dyes were adsorbed on the TiO2 surface, it is assumed that the BODIPY core is located in close proximity to the TiO2 surface. The dye YHO-2 (Φf = 0.62) exhibits a significantly higher fluorescence quantum yield (Φf) than YHO-1 (Φf = 0.06). The short-circuit photocurrent density (Jsc) and solar energy-to-electricity conversion yield (η) for a DSSC based on YHO-2 are greater than those of YHO-1. This work demonstrates that fluorescent BODIPY dyes can inject electrons efficiently from the BODIPY core to the conduction band (CB) of the TiO2 electrode, but non-fluorescent BODIPY dyes result in lowering of photocurrent generation due to radiationless relaxation of the photoexcited dye.
设计并开发了非烷基化 BODIPY
染料 YHO-1 和六烷基化 BODIPY
染料 YHO-2,这两种
染料在 BODIPY 核心的 8 位上有一个二苯基
氨基
咔唑作为电子奉献基团,在
咔唑环上有一个羧基己基作为锚定基团,可作为
染料敏化太阳能电池(DSSC)的光敏剂。根据 YHO-1 和 YHO-2 的分子结构,当这两种
染料被吸附在 TiO2 表面时,可以推测 BODIPY 核心位于靠近 TiO2 表面的位置。
染料 YHO-2(Φf = 0.62)的荧光量子产率(Φf)明显高于 YHO-1(Φf = 0.06)。基于 YHO-2 的 DSSC 的短路光电流密度(Jsc)和太阳能到电能的转换率(η)均高于 YHO-1。这项研究表明,荧光 BODIPY
染料能有效地将电子从 BODIPY 内核注入 TiO2 电极的导带 (CB),而非荧光 BODIPY
染料则会因光激发
染料的无辐射弛豫而降低光电流的产生。