Ji Young Kim, Ki Hong Kim, Dae‐Hwan Kim
2020
Citations
0
Influential Citations
5
Citations
Journal
Arabian Journal of Chemistry
Abstract
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.