Large electron mass anisotropy in anatase Ti1-xNb xO2 transparent conductor

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    (012)-oriented anatase Ti1-xNbxO2 (TNO) epitaxial films were grown on LaAlO3 (110) substrates by pulsed laser deposition technique, and electron mass (m*) of the TNO along the c-axis as well as along the a-axis were determined by polarized optical measurements with Drude analysis. The m* value of TNO (x = 0.01-0.06) along the a-axis was ∼0.6 mo, which was comparable to the electron masses of other transparent conducting materials, while m* along the c-axis was much larger, ∼2-4 m0. These results clearly indicate that TNO is more conductive along the a-axis than along the c-axis, and therefore, control of crystallographic orientation is needed for improvement in the conductivity of polycrystalline TNO films.

    Original languageEnglish
    Title of host publicationTransparent Conductors and Semiconductors for Optoelectronics
    Pages86-91
    Number of pages6
    Publication statusPublished - 2009
    Event2009 MRS Fall Meeting - Boston, MA, United States
    Duration: 2009 Nov 302009 Dec 4

    Publication series

    NameMaterials Research Society Symposium Proceedings
    Volume1109
    ISSN (Print)0272-9172

    Other

    Other2009 MRS Fall Meeting
    CountryUnited States
    CityBoston, MA
    Period09/11/3009/12/4

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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