[13p-D221-1~14] 6.4 Thin films and New materials

▼ [13p-D221-9] Crystallographic Anisotropy in Physical Properties of Ta₃N₅ Epitaxial Thin Films

〇Yannan Wang¹, Takuto Wakasugi¹, Yasushi Hirose¹, Yuji Masubuchi², Yuki Sugisawa³, Daiichiro Sekiba³, Tetsuya Hasegawa¹ (1.Univ. of Tokyo, 2.Hokkaido Univ., 3.Univ. of Tsukuba)

Keywords:Ta3N5, epitaxial thin film, photocatalytic material

Hydrogen generation by photocatalytic overall water splitting shows great potential in solving environmental problems resulted from the overuse of fossil fuels. Ta₃N₅ is a promising material that has nearly ideal bandgap (2.1eV) and band-edge positions for photocatalytic water splitting. In this study, epitaxial thin films of Ta₃N₅ were synthesized unprecedentedly and crystallographic anisotropy in the physical properties of the films was investigated. Optical reflection spectra of the epitaxial Ta₃N₅ thin films evaluated with linearly polarized light showed clear anisotropy in absorption edge, which agreed well with the theoretical prediction.