(TiO2)1–x(TaON)x Solid Solution for Band Engineering of Anatase TiO2
| Autor: | Shoichiro Nakao, Atsushi Suzuki, Yasushi Hirose, Tetsuya Hasegawa |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Anatase Materials science Band gap General Chemical Engineering Analytical chemistry 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Epitaxy 01 natural sciences Pulsed laser deposition Lattice constant X-ray photoelectron spectroscopy 0103 physical sciences Materials Chemistry Thin film 0210 nano-technology Solid solution |
| Zdroj: | Chemistry of Materials. 30:8789-8794 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b03231 |
| Popis: | Band engineering of anatase TiO2 was achieved by means of an anatase (TiO2)1–x(TaON)x (TTON) solid solution. Epitaxial thin films of TTON (0.1 ≤ x ≤ 0.9) were synthesized by nitrogen plasma-assisted pulsed laser deposition on (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 substrates. Epitaxial growth of anatase TTON was confirmed by X-ray diffraction. The lattice constants of the TTON thin films increased with TaON content in accordance with Vegard’s law, indicating formation of a complete solid solution. The bandgaps, band alignment, and refractive indices of the TTON thin films were investigated by combination of spectroscopic ellipsometry and X-ray photoelectron spectroscopy. The bandgap of the anatase TTON systematically decreased with increasing x, mainly because of an upward shift in the valence band maximum caused by broadening of the valence band as a result of hybridization of the shallow N 2p orbital. The position of the conduction band minimum was rather insensitive to chemical composition, which makes the ban... |
| Databáze: | OpenAIRE |
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