Abstract The TiO 2 films were modified with a dianion compound, 1,2-ethanedisulfonic acid disodium salt (ESD), to give a negative charge (ethane sulfonate anion) on the TiO 2 surface, i.e., TiO 2 -O-SO 2 -CH 2 -CH 2 -SO 3 − ), and effects of repulsion between the negative charge and ions (I 3 − ) of the electrolyte on the performance of dye-sensitized solar cells (DSSCs) were investigated. The reference device without any modification showed a power conversion efficiency (PCE) of 9.89%, whereas for the device with ESD(20)-TiO 2 /FTO, which was prepared by soaking bare TiO 2 /FTO in an ESD solution for 20 min, the PCE was increased to 10.97%, due to an increase in both short-circuit current ( J sc ) and open-circuit voltage( V oc ). It was verified from the measurements of electrochemical impedance, open-circuit voltage decay and dark current that the enhancement in the J sc and V oc values was attributed to the reduced back reaction between photoinjected electrons and I 3 − ions, resulting from the presence of the ethane sulfonate anions on the TiO 2 surface.

中文翻译：

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双阴离子化合物作为表面改性剂对TiO 2 基太阳能电池光生电子逆反应的影响

摘要 TiO 2 薄膜用二价阴离子化合物1,2-乙二磺酸二钠盐（ESD）改性，使TiO 2 表面带负电荷（乙磺酸阴离子），即TiO 2 -O-SO 2 - CH 2 -CH 2 -SO 3 - )，以及电解质的负电荷和离子(I 3 - ) 之间的排斥作用对染料敏化太阳能电池(DSSC) 性能的影响。未经任何修改的参考器件的功率转换效率 (PCE) 为 9.89%，而具有 ESD(20)-TiO 2 /FTO 的器件是通过将裸 TiO 2 /FTO 在 ESD 溶液中浸泡 20 分钟而制备的，由于短路电流 (J sc ) 和开路电压 ( V oc ) 的增加，PCE 增加到 10.97%。从电化学阻抗的测量中证实，