Dyes JY70−73 based on indeno[1,2-b]indole-spirofluorene (IISF) donor have been synthesized and applied in dye-sensitized solar cells, two of them feature donor−π−acceptor (D−π−A) configuration and the others adopt a D−D−π−A structure. Orientation-dependent effects of IISF donor are clearly observed in the photovoltaic properties of D−π−A type dyes JY70 and JY72, though close power conversion efficiency (PCE) achieves finally owing to the trade-off effect of open-circuit voltage (V_OC) and short-circuit current density (J_SC). By contrast, regioisomeric dyes JY71 and JY73 with an auxiliary diphenylamine donor present a significantly different photovoltaic performance. Under the [Co(phen)₃]^2+/3+ electrolyte, device based on JY73 gives much higher V_OC and J_SC, hence a greater PCE (7.40%) which is over two times higher than its regioisomeric JY71 (3.31%). Reasons for that have been systematically investigated. Cocktail co-sensitizations of dyes JY73 and JY70/JY72 both promote the PCEs up to over 8%, and device based on JY72&JY73 achieves the highest PCE of 8.32%.

染料JY70 - 73基于茚并[1,2-b]吲哚螺芴（IISF）供体已被合成并在染料敏化太阳能电池应用，其中两个供体配-π -受体（d-π-A）配置其他采用D-D-π-A结构。在D-π-A型染料JY70和JY72的光伏性质中可以清楚地观察到IISF供体的取向依赖性效应，尽管由于开路电压（V）的折衷效应最终实现了接近的功率转换效率（PCE）_OC）和短路电流密度（J _SC）。相反，区域异构染料JY71和JY73与辅助二苯胺供体一起使用时，光伏性能显着不同。在[Co（phen）₃ ] ^{2 + / 3 +}电解质下，基于JY73的器件可提供更高的V _OC和J _SC，因此具有更大的PCE（7.40％），是其区域异构体JY71（3.31％）的两倍以上）。原因已得到系统地调查。染料JY73和JY70 / JY72的鸡尾酒共敏化均将PCE提升至8％以上，基于JY72＆JY73的设备实现了8.32％的最高PCE。