纳米级包覆层厚度对染料敏化太阳电池中电子注入效率和电子寿命的影响

Effect of Coating Layer Thickness on the Electron Injection Efficiency and Electron Lifetime in Dye-sensitized Solar Cells

选取氧化钐作为包覆材料,采用浸渍法对已烧结好的纳米TiO2多孔薄膜电极进行修饰,并将其应用于染料敏化太阳电池中,研究了纳米级氧化钐包覆层厚度及均匀性对染料敏化太阳电池中电子注入效率和电子复合过程的影响和作用机制.结果表明,包覆层厚度对电子注入效率和电子复合具有明显影响,且电子注入效率和电子寿命随包覆层厚度的增加而呈现相反的变化趋势,包覆层厚度在0.4 nm以内,电池性能最好.

Sm2O3 was coated into the TiO2 films by a dipping method, and Sm2O3 with thickness no more than 2 nm was obtained. The effects of thickness of Sm2O3 coating layer on the electron injection process and the electron recombination of dye-sensitized solar cells （DSC） were investigated. The results indicate that the electron injection efficiency decreases obviously in the thicker SmzO3 coating films, while electrons have longer lifetime in the thicker coating film. As a result, the thicker coating thickness is, the lower conversion efficiency of DSC is. And the present research works indicate that the coating thickness of Sm203 layer within 0. 4 nm is suitable for dye-sensitized solar cells.