Improved Photoelectrode of Dye-Sensitized Solar Cell Using a ZnO/Zn2TiO4
Zinc titanate nanostructures were prepared by oxidation reaction technique. Here Zn mixed with 0, 10, 20 and 30 mol% of TiO2 powder was screened on alumina and FTO substrate, and then sintered at 400–600°C for 12 h under normal atmosphere. Through a detailed field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD) indicated that the nanostructures exhibited belt-like shapes of Zn2TiO4 phase. Moreover, the belt-like nanostructures of the synthesized Zn2TiO4 were studied in terms of optical properties by the UV-vis spectroscopy (UV-vis) to obtain band gap energy (Eg). The results showed that the Eg gap energy ranged from 3.57 eV to 3.63 eV as the mol% of TiO2 increased. In addition to the characterization of the nanobelts, the synthesized Zn2TiO4 nanostructures were applied as a bilayer semiconductor electrode in ZnO-based dye-sensitized solar cell (DSSC). It was shown that the use of Zn2TiO4 nanostructure with 10 mol% TiO2 in the ZnO/Zn2TiO4 electrode components of the DSSC revealed the highest obtainable efficiency.
Hyungsun Kim, Jian Feng Yang, Chuleol Hee Han, Somchai Thongtem and Soo Wohn Lee
W. Koonnasoot et al., "Improved Photoelectrode of Dye-Sensitized Solar Cell Using a ZnO/Zn2TiO4", Materials Science Forum, Vol. 695, pp. 505-508, 2011