Nanostructured ZnO films were fabricated by a chemical bath deposition method through an initial precipitation of layered hydroxide zinc acetate (LHZA) and subsequent pyrolytical transformation to ZnO. Contrary to our previous reports on the formation of flowerlike LHZA films at 60°C, we found that a morphology like brussels sprouts was obtained at a room temperature deposition of LHZA by controlling the reaction conditions carefully. The discrepancy in the formation mechanisms was discussed based on the supersaturation, nucleation, and crystal growth of LHZA in a methanolic solution of zinc acetate dihydrate. The resultant ZnO films were applied to photoanodes of dye-sensitized solar cells with N-719. An overall light-to-electricity conversion efficiency reached 5.1% at air mass 1.5 (100 mW/ cm2) when using the sproutslike ZnO film approximately 15 μm in thickness.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry