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Title
Japanese: 
English:β-Ga2O3 single crystal as a photoelectrode for water splitting 
Author
Japanese: 大島 孝仁, 神永 健一, 増子 尚徳, 向井 章, 佐々木 公平, 増井 建和, 倉又 朗人, 山腰 茂伸, 大友 明.  
English: T. Oshima, K. Kaminaga, H. Mashiko, A. Mukai, K. Sasaki, T. Masui, A. Kuramata, S. Yamakoshi, A. Ohtomo.  
Language English 
Journal/Book name
Japanese: 
English:Japanese Journal of Applied Physics 
Volume, Number, Page Vol. 52        111102-1-4
Published date Nov. 5, 2013 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://iopscience.iop.org/1347-4065/52/11R/111102
 
DOI https://doi.org/10.7567/JJAP.52.111102
Abstract We report the photoelectrode properties of an n-type β-Ga2O3 single crystal in aqueous solutions. The conduction and valence band-edge potentials were found to be 1.1 V higher and 2.5 V lower than the H+/H2 and O,sub>2/H2O redox potentials, respectively. Photocurrent drastically increased as photogenerated carriers were excited at a photon energy higher than the fundamental absorption edge of 4.7 eV. The incident photon-to-current conversion efficiency was 36% at 5.2 eV. Gaseous oxygen and hydrogen evolved from the photoelectrode and Pt counter electrode, respectively. The stoichiometric water splitting was demonstrated by applying an external bias of 1 V.

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