Highly reduced anatase TiO2-𝛿 thin films obtained via low-temperature reduction

Year: 2011 DOI: 10.1143/APEX.4.035801

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Atsushi Kitada, Shigeru Kasahara, Takahito Terashima, Kazuyoshi Yoshimura, Yoji Kobayashi, Hiroshi Kageyama.   Applied Physics Express, 2011, 4, 035801/1-3.


We report the prepn. and phys. properties of reduced anatase TiO2-𝛿 thin films obtained via a low-temp. (low-T) redn. using CaH2. The oxygen amts. were controlled in a wider range than ever reported. Some highly reduced anatase films showed resistivities as low as 10-3 ohm cm at room temp., both in metallic and semiconducting states. The most conducting metallic sample has very high carrier concn. of 1.6 x 1021 cm-3, comparable with those of metal-doped anatase films. Moreover, the magnetoresistance of the films changed its sign twice as a function of 𝛿. [on SciFinder(R)]