@article{6dd035db121644228789089e50154bb7,
title = "Optical and structural investigations on titanium oxynitride films for visible-UV photocatalytic applications",
abstract = "We report on the epitaxial growth of titanium oxynitride (TiOxNy) films on α-Al2O3 (0001) substrates by using a pulsed-laser deposition technique and their optical properties. Using TiN as a solid source, N content (y) in the films was tuned by changing the partial pressure of O2 gas. The crystalline phase was found to evolve up to y ≈ 0.4 either from rock-salt type or from rutile-type structures. The optical absorption spectra of the films had two distinct components in regions of 0.44-2.4 eV and 2.4-6 eV, which arise from d-d and charge-transfer transitions, respectively. The former transition decreased with decreasing y and vanished at y ≈ 0.26, where a fundamental absorption edge due to the latter transition was found to be 2.4 eV. The results demonstrate a range of anion compositions in the TiOxNy being suitable for visible-light harvesting applications.",
author = "Jun Mizushiro and Kohei Yoshimatsu and Naoki Ohashi and Masahiko Tanaka and Osami Sakata and Akira Ohtomo",
note = "Funding Information: The authors thank Jun-ichi Yamaura for preliminary synchrotron XRD measurements at KEK-PF. The synchrotron XRD measurements were performed under the approval of the NIMS Synchrotron X-ray Station at SPring-8 (Proposal Nos. 2017A4700 and 2019A4702). The authors also thank Y. Katsuya for technical support. This work was partly supported by MEXT Element Strategy Initiative to Form Core Research Center (Grant No. JPMXP0112101001) and a Grant-in-Aid for Scientific Research (Nos. 18H03925 and 19H02588) from the Japan Society for the Promotion of Science Foundation. Publisher Copyright: {\textcopyright} 2020 Author(s).",
year = "2020",
month = apr,
day = "7",
doi = "10.1063/1.5143609",
language = "English",
volume = "127",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "13",
}