染料敏化太阳电池有序介孔SiO_2/离子液体凝胶电解质的研究

Study on Gel Electrolyte Based on Order Mesoporous SiO_2/Ionic Liquid for Dye-sensitized Solar Cells

以P123为模板剂,采用溶胶-凝胶法制备有序介孔SiO2,用N2吸附、扫描电镜及透射电镜对样品进行分析。结果表明,制备的介孔SiO2呈短棒状,具有有序柱状孔结构,平均孔径为5.75nm。有序介孔SiO2固化二元离子液体(1-甲基-丙基咪唑碘/1-甲基-己基咪唑碘)形成凝胶电解质。由于凝胶电解质中离子液体在介孔SiO2的孔道中有序排列,使凝胶电解质I3-的扩散系数增大,从而降低了电解质的内阻,抑制了染料敏化纳晶多孔膜-凝胶电解质界面的复合反应,使凝胶电解质染料敏化太阳电池具有较大的开路电压和填充因子,光电转换效率达到5.22%。

Order mesoporous SiO2 are prepared by Sol-gel method using P123 as the template. Their characteristics are analyzed by N2 adsorption techniques, scan electron microscopy and transmission electron microscopy. The results show that mesoporous SiO2 exhibites ordered rod-like pore structure, and the mean pore size is about 5.75nm. Gel electrolytes for dye-sensitized solar cells are fabricated by solidifying binary ionic liquid （1-methyl-3-propylimidazolium iodide and 1-methyl-3-hexylimidazolium iodide） with order mesoporous SiO2. Lowering resistance of gel electrolyte and inhibitting recombination reaction rate between the interfaces of dye-sensitized nanocrystalline TiO2 film/gel electrolyte are achieved due to the increase of diffusion coefficient of I3 - in gel electrolyte by forming the ordered structure of ionic liquid in the mesopore of mesopoeous SiO2. Therefore, the photovoltaic performance of dye-sensitized solar cells with gel electrolyte are improved, the overall conversion efficiency is 5. 22%.