Single crystalline anatase TiO2 nanoparticles were synthesized and sintered to obtain mesoporous TiO2 photoelectrodes. Surface treatment was performed on the resulting TiO2 photoelectrodes using oxygen, nitrogen, or nitrogen methane (1:1) plasma. X-ray absorption near-edge structure analysis and x-ray photoelectron spectroscopy were used to show the differences among the surface treatments. Dye-sensitized solar cells fabricated from as-sintered and plasma-treated TiO2 photoelectrodes exhibit different cell efficiencies. Compared to the as-sintered sample, the nitrogen methane plasma treatment enhances the cell efficiency by 24.1, followed by the oxygen plasma treatment (19.7) and the nitrogen plasma treatment (5.0). The differences in the cell efficiency are attributed to the differences in the photoelectrode structures (oxygen vacancy and C-C sp2 to sp 3 bonding ratio) and the resulting properties (incident photon to conversion efficiency and dye absorption).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry