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

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-0.40V,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,钉染料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.%A dye-sensitized solar cell(DSSC)based on a 3-aminopropyltdmethoxysilane(APTS)-modified TiO2 electrode was fabricated.This cell generated a short current of 18.32 mA.cm-2,an open cm-2 white light irradiation from a xenon lamp.The three DSSC parameters for the bare TiO2 electrode were 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-0.40V,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.