Large electron mass anisotropy in a d -electron-based transparent conducting oxide: Nb-doped anatase TiO2 epitaxial films

Yasushi Hirose; Naoomi Yamada; Shoichiro Nakao; Taro Hitosugi; Toshihiro Shimada; Tetsuya Hasegawa

doi:10.1103/PhysRevB.79.165108

Large electron mass anisotropy in a d -electron-based transparent conducting oxide: Nb-doped anatase TiO2 epitaxial films

Yasushi Hirose, Naoomi Yamada, Shoichiro Nakao, Taro Hitosugi, Toshihiro Shimada, Tetsuya Hasegawa

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

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	https://doi.org/10.1103/PhysRevB.79.165108
Publication status	Published - 2009 Apr 17

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.79.165108

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Large electron mass anisotropy in a d -electron-based transparent conducting oxide : Nb-doped anatase TiO2 epitaxial films. / Hirose, Yasushi; Yamada, Naoomi; Nakao, Shoichiro; Hitosugi, Taro; Shimada, Toshihiro; Hasegawa, Tetsuya.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 16, 165108, 17.04.2009.

Research output: Contribution to journal › Article › peer-review

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AU - Hasegawa, Tetsuya

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Large electron mass anisotropy in a d -electron-based transparent conducting oxide: Nb-doped anatase TiO2 epitaxial films

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