物理化学学报 >> 2011, Vol. 27 >> Issue (02): 419-424.doi: 10.3866/PKU.WHXB20110209

电化学和新能源 上一篇    下一篇

3-氨基丙基三甲氧基硅烷自组装提高染料敏化太阳能电池的效率

劳春峰1, 初增泽2, 邹德春2   

  1. 1. 海尔集团技术研发中心, 山东 青岛 266103;
    2. 北京大学化学与分子工程学院, 北京 100871
  • 收稿日期:2010-09-13 修回日期:2010-11-24 发布日期:2011-01-25
  • 通讯作者: 邹德春 E-mail:dczou@pku.edu.cn
  • 基金资助:

    国家自然科学基金(50125310, 90401028)及国家重点基础研究发展规划项目(973) (2002CB613405)资助

Self-Assembly of 3-Aminopropyltrimethoxysilane to Improve the Efficiency of Dye-Sensitized Solar Cells

LAO Chun-Feng1, CHU Zeng-Ze2, ZOU De-Chun2   

  1. 1. Research and Development Center of Haier Group, Qingdao 266103, Shandong Province, P. R. China;
    2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2010-09-13 Revised:2010-11-24 Published:2011-01-25
  • Contact: ZOU De-Chun E-mail:dczou@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50125310, 90401028) and National Key Basic Research Program of China (973) (2002CB613405).

摘要:

以3-氨基丙基三甲氧基硅烷(APTS)修饰的二氧化钛为负极制备的染料敏化太阳能电池在100 mW·cm-2的模拟太阳光照下的短路电流、开路电压、光电转换效率分别为18.32 mA·cm-2、775.9 mV、9.15%. 而没有经过ATPS修饰的电池三项性能参数分别为18.08 mA·cm-2、749.9 mV、7.70%, 修饰后电池的光电转换效率提高了18.8%, 同时填充因子由0.57提高为0.64. 暗电流-电压曲线显示起始电压从-0.30 V变化到-0.40 V, 表明二氧化钛电极和电解液之间的暗反应得到了有效抑制, APTS作为阻挡层减少了二氧化钛电极表面的缺陷与表面态. 另外, 通过实验设计, 将APTS与染料层-层自组装于二氧化钛电极上, 通过X射线光电子能谱(XPS)研究了二氧化钛层、APTS、染料的作用形式. 定性与定量结果表明: APTS中的乙氧基部分脱除后形成了Si―O―Ti单桥或者双桥键, 钌染料cis-Ru(dcpyH2)2(SCN)2通过分子中的部分―COOH与APTS中的―NH2形成的静电作用力吸附在TiO2电极上. 傅里叶变换红外(FT-IR)光谱的结果进一步证明了这种分子间作用.

关键词: 染料敏化太阳能电池, 3-氨基丙基三甲氧基硅烷, 自组装, 二氧化钛, X射线光电子能谱

Abstract:

A dye-sensitized solar cell (DSSC) based on a 3-aminopropyltrimethoxysilane (APTS)- modified TiO2 electrode was fabricated. This cell generated a short current of 18.32 mA·cm-2, an open voltage of 775.9 mV, and its overall photo-to-electricity conversion efficiency was 9.15% under 100 mW·cm-2 white light irradiation from a xenon lamp. The three DSSC parameters for the bare TiO2 electrode were found to be 18.08 mA·cm-2, 749.9 mV, and 7.70%. Compared with the unmodified solar cell, the overall conversion efficiency improved by 18.8% and the fill factor improved from 0.57 to 0.64. This improvement is attributed to the inhibition of the back reaction at the interface between the semiconductor and the electrolyte. The dark current-applied voltage curve shows that the onset voltage shifts from -0.30 to -0.40 V, which indicates a reduction in defects and surface states on the TiO2 surface because of the presence of APTS. Furthermore, special experiments were conducted to investigate the interaction among TiO2, APTS, and the cis-Ru(dcpyH2)2(SCN)2 dye. In these experiments, APTS and the dye were self- assembled onto a TiO2 electrode in layers. The interaction was characterized by X-ray photoelectron spectroscopy (XPS). Qualitative and quantitative results showed that the ―OCH2CH3 was partially removed and it formed mono-bridge or bi-bridge Si―O―Ti bonds. The cis-Ru(dcpyH2)2(SCN)2 dye adsorbed onto APTS through an electrostatic interaction between ―COOH and ―NH2 from the dye. FT-IR spectra further confirmed this inner interaction.

Key words: Dye-sensitized solar cell, 3-Aminopropyltrimethoxysilane, Self-assembly, TiO2, X-ray photoelectron spectroscopy

MSC2000: 

  • O649