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Effects of a dianion compound as a surface modifier on the back reaction of photogenerated electrons in TiO2-based solar cells
- Effects of a dianion compound as a surface modifier on the back reaction of photogenerated electrons in TiO2-based solar cells
- Kim, Ji Young; Kim, Ki Hong; Kim, Dae-Hwan; Han, Yoon Soo
- DGIST Authors
- Kim, Dae-Hwan
- Issue Date
- Arabian Journal of Chemistry
- Article Type
- Article in Press
- Electrolytes; Electrostatic devices; Ethane; Negative ions; Open circuit voltage; Solar cells; Titanium dioxide; Back reaction; Dianions; Disodium salt; Electrochemical impedance; Open circuit voltage decays; Photo-injected electrons; Photogenerated electrons; Power conversion efficiencies; Dye-sensitized solar cells
- The TiO2 films were modified with a dianion compound, 1,2-ethanedisulfonic acid disodium salt (ESD), to give a negative charge (ethane sulfonate anion) on the TiO2 surface, i.e., TiO2-O-SO2-CH2-CH2-SO3 −), and effects of repulsion between the negative charge and ions (I3 −) 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)-TiO2/FTO, which was prepared by soaking bare TiO2/FTO in an ESD solution for 20 min, the PCE was increased to 10.97%, due to an increase in both short-circuit current (Jsc) and open-circuit voltage(Voc). It was verified from the measurements of electrochemical impedance, open-circuit voltage decay and dark current that the enhancement in the Jsc and Voc values was attributed to the reduced back reaction between photoinjected electrons and I3 − ions, resulting from the presence of the ethane sulfonate anions on the TiO2 surface. © 2018 King Saud University
- Elsevier B.V.
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- Convergence Research Center for Solar Energy1. Journal Articles
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