[13p-D221-1~14] 6.4 薄膜新材料

▼ [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)

キーワード：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.