Direct growth of transparent conducting Nb-doped anatase TiO2 polycrystalline films on glass

Naoomi Yamada, Taro Hitosugi, Junpei Kasai, Ngoc Lam Huong Hoang, Shoichiro Nakao, Yasushi Hirose, Toshihiro Shimada, Tetsuya Hasegawa

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    62 Citations (Scopus)

    Abstract

    This paper proposes a novel sputter-based method for the direct growth of transparent conducting Ti1-xNbxO2 (TNO) polycrystalline films on glass, without the need for any postdeposition treatments, by the use of an initial seed-layer. Anatase TNO epitaxial films grown on LaAlO3 (100) substrates under a reducing atmosphere exhibited a low resistivity (ρ) of (3-6) × 10-4 cm. On glass, however, highly resistive rutile phase polycrystalline films (ρ ∼100 Ωcm) formed preferentially under the same conditions. These results suggest that epitaxial stabilization of the oxygen-deficient anatase phase occurs on lattice-matched substrates. To produce a similar effect on a glass surface, we deposited a seed-layer of anatase TNO with excellent crystallinity under an increased oxygen atmosphere. As a result, anatase phase TNO polycrystalline films could be grown even under heavily reducing atmospheres. An optimized film exhibited ρ =1.1× 10-3 Ω cm and optical absorption lower than 10% in the visible region. This ρ value is more than one order of magnitude lower than values reported for directly deposited TNO polycrystalline films. This indicates that the seed-layer method has considerable potential for producing transparent conducting TNO polycrystalline films on glass.

    Original languageEnglish
    Article number123702
    JournalJournal of Applied Physics
    Volume105
    Issue number12
    DOIs
    Publication statusPublished - 2009

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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