Fabrication and Characterization of Semiconductor Photoelectrodes with Orientation-Controlled α-Fe2O3 Thin Films

H. Mashiko, K. Yoshimatsu, T. Oshima, A. Ohtomo

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Epitaxial α-Fe2O3 thin films on conducting Ta-doped SnO2 bottom layers are prepared by pulsed-laser deposition in order to elucidate variation of the photoelectrochemical (PEC) properties for the water oxidation reaction on the α-Fe2O3 photoanodes with different orientation and thickness. Cyclic voltammetry under illumination shows that current density (photocurrent onset potential) of the m-axis oriented samples is considerably larger (lower) than that of the c-axis oriented ones. Using electrochemical impedance spectroscopy under illumination, we ascribe these behaviors to difference in surface states between c- and m-planes besides anisotropic conductivity along the individual axes. Our study demonstrates the power of utilizing well-defined epitaxial thin films to investigate the anisotropic PEC properties of visible-light-driven photoelectrodes.

本文言語English
ページ(範囲)2747-2752
ページ数6
ジャーナルJournal of Physical Chemistry C
120
5
DOI
出版ステータスPublished - 2016 2 18
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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