| Autor: |
Ay, Hasan Tayfun, Sarac, Mehmet Fahri, Solakyildirim, Tuba |
| Zdroj: |
Brazilian Journal of Physics; February 2025, Vol. 55 Issue: 1 |
| Abstrakt: |
The photosensing properties of SnO2-coated TiO2NWs have been fabricated by a two-step sequential deposition method; a thermal oxidation method followed by a hydrolysis method. Pure TiO2NWs show vertically aligned and uniformly distributed NW arrays on Ti foil. It was observed that the SnO2coating accumulated on the TiO2NW surfaces with increasing Sn concentration. It filled the spaces between the NWs and finally covered the entire surface of the 100 mM SnO2concentrated sample. The presence of increased Sn concentration on the surface was qualitatively determined by EDS and XPS measurements. The PL intensity decreases as the SnO2coating increases, indicating recombination retardation. Coating thickness also decreases the band gap since electron excitation requires less energy. Since electrons are easily excited by the conduction band of TiO2, SnO2coatings can form an energy level within the band gap. The highest photosensitivity was 142.05% with 100-mM SnO2-coated TiO2NW arrays. An alternative approach to photosensitive UV devices can be made with 100-mM SnO2-coated TiO2NW arrays due to their excellent light absorption properties and efficient charge carrier generation. |
| Databáze: |
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