Effect of hydroxyl group attachment on TiO₂ films for dye-sensitized solar cells

详细信息	查看全文 | 推荐本文 |

• 作者：Alagesan Subramanian ; Hong-Wen Wang ; ^{hongwen@cycu.edu.tw}
• 关键词：Hydroxyl ; TiO2 ; Dye-sensitized solar cell
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 August, 2012
• 卷：258
• 期：20
• 页码：7833-7838
• 文件大小：870 K

摘要

The effect of hydroxyl group attachment on the nanocrystalline TiO₂ photoelectrodes for the performance of dye-sensitized solar cells (DSSCs) was investigated. The photoelectrodes were prepared using commercial TiO₂ nanoparticles (Degussa P25). Hydroxyl groups were attached to the TiO₂ film using hydrogen peroxide by thermal treatment method and the OH-attached sample was compared with the untreated one. The FTIR spectra evidenced the presence of hydroxyl groups attached to the TiO₂ nanoparticles. Thermogravimetric analysis showed that the sample treated with hydrogen peroxide was attached with higher weight percentage of hydroxyl groups. The photovoltaic characteristics of the as-prepared DSSCs were measured by an electrochemical analyzer under the standard AM 1.5 illumination of 100 mW/cm² light source. The hydroxyl groups attached sample showed an enhanced performance of DSSC than that of the blank P25 film. It shows that higher amount of dye was adsorbed due to the surface hydroxyl groups on the H₂O₂-treated samples. Electrochemical impedance spectroscopy (EIS) measurement indicated that the electron lifetime for the H₂O₂-treated sample was longer than that of the untreated sample. The higher dye loading due to the attached hydroxyl groups on the sample was confirmed using UV-vis measurement.