S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
Facile preparation of TiO2 nanobranch/nanoparticle hybrid architecture with enhanced light harvesting properties for dye-sensitized solar cells
- Kim, Ju Seong; Shin, Seong Sik; Han, Hyun Soo; Shin, Sun; Suk, Jae Ho; Kang, Kisuk; Hong, Kug Sun; Cho, In Sun
- Issue Date
- Journal of Nanomaterials, Vol.2015, p. 139715
- We report TiO2 nanobranches/nanoparticles (NBN) hybrid architectures that can be synthesized by a facile solution phase method. The hybrid architecture simultaneously improves light harvesting and charge collection performances for a dye-sensitized solar cell. First, TiO2 nanorods with a trunk length of 2 mu m were grown on a fluorine-doped tin oxide (FTO)/glass substrate, and then nanobranches and nanoparticles were deposited on the nanorods' trunks through a solution method using an aqueous TiCl3 solution at 80 degrees C. The relative amount of nanobranches and nanoparticles can be controlled by multiplying the number of TiCl3 treatments to maximize the amount of surface area. We found that the resultant TiO2 NBN hybrid architecture greatly improves the amount of dye adsorption (five times compared to bare nanorods) due to the enhanced surface area, while maintaining a fast charge collection, leading to a three times higher current density and thus tripling the maximum power conversion efficiency for a dye-sensitized solar cell.