Abstract
Electron mass anisotropy in the Nb-doped anatase TiO2 (TNO) was determined by polarized infrared spectroscopy measurements for (012)-oriented TNO epitaxial films. The electron mass along the c axis, m 001, derived by Drude analyses, was found to be 0.5-3.3 m0, which was 3-6 times larger than that along the a axis, m 100, 0.2-0.6 m0. This large anisotropy was attributed to not only the anisotropic crystal structure but also the d -orbital-dominated conduction band. These results indicate that control of crystallographic orientation is of crucial importance for realizing high conductivity in polycrystalline TNO films.
| Original language | English |
|---|---|
| Article number | 165108 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 79 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 2009 Apr 17 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Hirose, Y., Yamada, N., Nakao, S., Hitosugi, T., Shimada, T., & Hasegawa, T. (2009). Large electron mass anisotropy in a d -electron-based transparent conducting oxide: Nb-doped anatase TiO2 epitaxial films. Physical Review B - Condensed Matter and Materials Physics, 79(16), [165108]. https://doi.org/10.1103/PhysRevB.79.165108