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采用光电化学测试技术考察了金属离子修饰对介孔纳米TiO_2(m-TiO_2)膜电极及其DSSCs性能的影响。结果表明,浸渍法形成的金属氧化物微晶既能覆盖在m- TiO_2多孔膜表面,又能夹杂于m-TiO_2纳米颗粒之间。表面微晶可以抑制m-TiO_2多孔膜的塌陷和表面态电子陷阱的形成,从而降低界面电子转移电阻;而夹杂于颗粒间的微晶则起到阻止电子传输的作用,提高电子传输电阻。通过优化离子修饰条件,可以在一定程度上改善DSSC的光电转换效率。
The effect of metal ion modification on the properties of mesoporous nano-TiO_2 (m-TiO_2) electrode and its DSSCs was investigated by using photoelectrochemical test. The results show that the metal oxide crystallites formed by the impregnation method can both cover the surface of the m-TiO 2 porous membrane and intercalate between the m-TiO 2 nanoparticles. Surface microcrystals can suppress the collapse of m-TiO 2 porous films and the formation of electron traps on the surface states, thus reducing the interfacial electron transfer resistance. The intergranular microcrystals prevent the electron transport and enhance the electron transport resistance. By optimizing the conditions of ion modification, the photoelectric conversion efficiency of DSSC can be improved to a certain extent.