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 journalArticlepeer-review

64 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 languageEnglish
Article number165108
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number16
DOIs
Publication statusPublished - 2009 Apr 17
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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