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Effect of Surface Protonation on Device Performance and Dye Stability of Dye-sensitized TiO2 Solar Cell
Kun-jie Wu,Kai Shen,Yang Yu,De-liang Wang*
Author NameAffiliationE-mail
Kun-jie Wu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China  
Kai Shen Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China  
Yang Yu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China  
De-liang Wang* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, ChinaCAS Key Laboratory of Energy Conversion Materials, University of Science and Technology of China, Hefei 230026, ChinaSt eedewang@ustc.edu.cn 
Abstract:
A flat thin TiO2 film was employed as the photo-electrode of a dye sensitized solar cell (DSSC), on which only a geometrical mono-layer of dye was attached. The effect of sur-face protonation by HCl chemical treatment on the performance of DSSCs was studied. The results showed that the short-circuit current Jsc increased significantly upon the HCl treatment, while the open-circuit voltage Voc decreased slightly. Compared to the untreated DSSC, the Jsc and energy conversion efficiency was increased by 31% and 25%, respectively, for the 1 mol/L HCl treated cell. TiO2 surface protonation improved electronic coupling between the chemisorbed dye and the TiO2 surface, resulting in an enhanced electron in-jection. The decreased open-circuit voltage after TiO2 surface protonation was mainly due to the TiO2 conduction band edge downshift and was partially caused by increased electron recombination with the electrolyte. In situ Raman degradation study showed that the dye stability was improved after the TiO2 surface protonation. The increased dye stability was contributed by the increased electron injection and electron back reaction with the electrolyte under the open-circuit condition.
Key words:  Dye-sensitized solar cell, Surface protonation, Electron injection, Recombina-tion, Dye stability
FundProject:
TiO2表面质子化对染料敏化太阳能电池性能及吸附染料稳定性的影响
吴昆杰,沈凯,于洋,王德亮*
摘要:
采用致密平整TiO2薄膜作为染料敏化太阳能电池光电极,并研究了HCl处理表面质子化对电池性能的影响. 结果表明,HCl处理后电池的短路电流显著提升,电池的开路电压则有轻微的下降,电池电流提升了31%,而能量转化效率则提升了25%. 这是因为TiO2的表面质子化增强了吸附染料与TiO2间的电学耦合,提高了染料中激发电子向TiO2导带的注入速率. 而电压的下降,一方面是由于质子化会引起TiO2导带能级
关键词:  染料敏化太阳能电池,表面质子化,激发态电子注入,复合,稳定性
DOI:10.1088/1674-0068/25/06/733-738
分类号: