Abstract
Electron mass anisotropy in the Nb-doped anatase ${\text{TiO}}_{2}$ (TNO) was determined by polarized infrared spectroscopy measurements for (012)-oriented TNO epitaxial films. The electron mass along the $c$ axis, ${m}_{⟨001⟩}^{\ensuremath{\ast}}$, derived by Drude analyses, was found to be $0.5--3.3\text{ }{m}_{0}$, which was 3--6 times larger than that along the $a$ axis, ${m}_{⟨100⟩}^{\ensuremath{\ast}}$, $0.2--0.6\text{ }{m}_{0}$. 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.