Vibrational–Electrical Properties Relationship in Donor-Doped TiO2 by Raman Spectroscopy
| Autor: | Valeria Russo, Shoichiro Nakao, Piero Mazzolini, Taro Hitosugi, Carlo Spartaco Casari, A. Li Bassi, Tetsuya Hasegawa |
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| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Anatase Materials science 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake Crystallinity law Deposition (phase transition) Physical and Theoretical Chemistry Crystallization Dopant Reducing atmosphere Doping technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Chemical physics symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 120:18878-18886 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Transparent conducting TiO2, obtained by Nb or Ta doping of the anatase structure, is gaining increasing attention for the development of transparent electrodes. Usually, regardless of the deposition technique, a crystallization process in a reducing atmosphere is necessary to achieve large mobility; in addition, electrical and optical properties are also strongly sensitive to the oxygen deposition pressure. These facts reveal that the defect chemistry of donor-doped TiO2 is not trivial and involves a strict interplay among extrinsic dopant atoms, oxygen vacancies, and “electron killer” defects such as Ti vacancies and O interstitials. We here present a Raman characterization of donor-doped TiO2 films synthesized under several deposition and postannealing conditions, employing different doping levels and dopant elements (i.e., Ta and Nb). Correlations between structure, crystallinity, shift and width of Raman peaks, and electrical properties are shown and discussed. In particular, a clear relationship bet... |
| Databáze: | OpenAIRE |
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