Three new dyes containing diphenylamine as electron donor, benzene (BIM1), benzothiadiazole (BTD) (BIM2) and N-ethylhexylbenzotriazole (BTZ) (BIM3) as auxiliary electron acceptors, quinoline as π-bridge and cyanoacrylic acid as anchoring group were synthesized in D-A-π-A structure for use in dye-sensitized solar cells (DSSCs). The optical, electrochemical, theoretical and photovoltaic methods were performed to understand the auxiliary acceptor influence on the performance of these dyes. Compared to the other dyes, the DSSC with dye BIM3 slightly increases the open circuit voltage (V_oc) owing to the retardation of charge recombination by BTZ. However, replacement of benzene or BTZ by BTD unit causes a large red shift of the absorption spectra, leading BIM2 cell to produce the highest short circuit current density (J_sc). Thus, among the three D − A−π−A dyes, BIM2 is determined to be the most efficient dye, which reached a V_oc of 0.627 V and J_sc of 11.53 mA cm^–2, corresponding to an overall power conversion efficiency of 5.21% in the presence of chenodeoxycholic acid (CDCA) as the coadsorbent. These results suggest that the insertion of benzothiadiazole as auxiliary acceptor into quinoline-based D − A−π−A dyes can effectively improve photovoltaic performance of DSSCs.

合成了三种新的染料，分别含有二苯胺作为电子供体，苯（BIM1），苯并噻二唑（BTD）（BIM2）和N-乙基己基苯并三唑（BIM3）作为辅助电子受体，喹啉为π桥，氰基丙烯酸为锚固基。 DA-π-A结构，用于染料敏化太阳能电池（DSSC）。进行了光学，电化学，理论和光伏方法，以了解辅助受体对这些染料性能的影响。与其他染料相比，带有染料BIM3的DSSC稍微增加了开路电压（V _oc）是由于BTZ阻止了电荷重组。但是，用BTD单元代替苯或BTZ会引起吸收光谱的大红移，从而导致BIM2电池产生最高的短路电流密度（J _sc）。因此，在三种D-A-π-A染料中，BIM2被确定为最有效的染料，其V _oc为0.627 V，J _sc为11.53 mA cm ^–2，相当于在鹅去氧胆酸（CDCA）作为共吸附剂存在下的总功率转换效率为5.21％。这些结果表明，将苯并噻二唑作为辅助受体插入到喹啉基D-A-π-A染料中可以有效地改善DSSC的光伏性能。