Solid-state dye-sensitized solar cells have been fabricated with mesoporous TiO$_2$ photoanode and N719 dye as photosensitizer. First, TiO$_2$ and non-doped, Zn- and Mg-doped CuCrO$_2$ nanoparticles have been synthesized by sol–gelmethod. In addition, the TiO$_2$ pastes have been prepared through Pechini-type sol–gel method. The effect of TiO$_2$ particle size, mesoporous TiO$_2$ photoanode thickness and solid-state electrolyte thickness on the efficiency of the fabricated devices has been investigated. Our results show that in spite of the low amount of dye loading for photoanode with large TiO$_2$nanoparticles (80–180 nm), the dye-sensitized solar cell made from it has higher efficiency than that constructed from thephotoanode comprising of small particles about 10–15 nm in size. The higher efficiency is attributed to the longer diffusionlength of electrons because of a better electron transport and penetration of a large amount of CuCrO$_2$ nanoparticles inthe porous structure of TiO$_2$ photoanode. By using the doped CuCrO$_2$ nanoparticles, the efficiency has been increasedfrom 0.027% for TiO$_2$/N719 dye/CuCrO$_2$ to 0.033% for TiO$_2$/N719 dye/CuCrO$_2$:Zn and further increased to 0.042% for TiO$_2$/N719 dye/CuCrO$_2$:Mg. The efficiency enhancement by doping is ascribed to the conductivity improvement due to the presence of impurity atoms.
Volume 43, 2020
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