One-dimensional TiO2 nanostructures display remarkable performance in dye-sensitized solar cells by reducing the charge recombination; however, their relatively low surface area restricts both the dye absorption amount and solar energy conversion efficiency. Hydrothermal treatment of anodic TiO2 nanotube arrays in 0.01 M (NH4)2TiF 6 increased the surface area of TiO2 photoanodes by generating hierarchical architecture. Hierarchical TiO2 nanostructures obtained by optimal hydrothermal treatment conditions exhibited a wire-in-tube architecture decorated by nanoparticles on both the inner nanowire and the outer nanotube, which further increased the surface area. Flexible dye-sensitized solar cells based on these hierarchical nanostructures yield significantly improved solar energy conversion efficiencies due to enlarged surface area, increased dye loading, and superior light scattering capacity.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)