We report a new series of indoline dyes with a donor–aromatic–acceptor (D–π–A) structure. D–π–A metal-free organic dyes with indoline–benzothiazole–rhodanine units were synthesized and their photovoltaic performances were evaluated. The photoelectric conversion efficiency (η) of the indoline–benzothiazole–rhodanine dye is 3.7%, while that of the indoline–thiophene–rhodanine dye is 0.9% under the same conditions. The incident photon-to-current conversion efficiencies (IPCEs) of these dyes are 60% and 25%, respectively, at 500 nm. To understand their electronic structures, the geometries of the dyes were optimized by density functional theory (DFT) calculations at the 6-31G(d) level using a B3LYP exchange-correlation functional. As a result, the localized highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the indoline–benzothiazole–rhodanine dye were obtained and were compared with those of the indoline–thiophene–rhodanine dye.
我们报告了一系列具有供体-芳香族-受体(D-π-A)结构的新二氢
吲哚染料。合成了具有二氢
吲哚-
苯并噻唑-
绕丹宁单元的D-π-A无
金属有机
染料,并评估了它们的光伏性能。在相同条件下,二氢
吲哚-
苯并噻唑-
绕丹宁染料的光电转换效率(η)为3.7%,而二氢
吲哚-
噻吩-
绕丹宁染料的光电转换效率为0.9%。这些
染料在 500 nm 处的入射光子到电流的转换效率 (IPCE) 分别为 60% 和 25%。为了了解它们的电子结构,使用 B3LYP 交换相关泛函在 6-31G(d)
水平上通过密度泛函理论 (DFT) 计算优化了
染料的几何形状。结果,获得了二氢
吲哚-
苯并噻唑-
绕丹宁染料的局域最高占据分子轨道(HOMO)和最低未占分子轨道(LUMO),并与二氢
吲哚-
噻吩-
绕丹宁染料进行了比较。