TY - JOUR
T1 - Large electron mass anisotropy in a d -electron-based transparent conducting oxide
T2 - Nb-doped anatase TiO2 epitaxial films
AU - Hirose, Yasushi
AU - Yamada, Naoomi
AU - Nakao, Shoichiro
AU - Hitosugi, Taro
AU - Shimada, Toshihiro
AU - Hasegawa, Tetsuya
PY - 2009/4/17
Y1 - 2009/4/17
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.79.165108
DO - 10.1103/PhysRevB.79.165108
M3 - Article
AN - SCOPUS:67650302001
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 16
M1 - 165108
ER -