Journal Article Highly oriented epitaxial CaFe<sub>2</sub>O<sub>4</sub> thin films on TiO<sub>2</sub> substrates grown by pulsed-laser deposition

西山, 奈菜  ,  Nishiyama, Nana  ,  増子, 尚徳  ,  Mashiko, Hisanori  ,  吉松, 公平  ,  Yoshimatsu, Kohei  ,  堀場, 弘司  ,  Horiba, Koji  ,  組頭, 広志  ,  Kumigashira, Hiroshi  ,  大友, 明  ,  Ohtomo, Akira

638pp.406 - 409 , 2017-09 , Elsevier
CaFe2O4 (CFO) is an oxide semiconductor being usable for a photocathode, but its single crystal is so far grownonly by a high-pressure bulk synthesis method. Using pulsed-laser deposition, we have obtained the (010)-orientedCFO films on TiO2 (100) substrates. The epitaxial structure included twin domains with 1.5° tilting fromthesurface normal and sixfold domainswith in-plane rotations of±70° with respect to the b axis of TiO2,whichwasexplained by taking a number of probable arrangements between FeO6 and TiO6 octahedra into account. X-rayabsorption spectroscopy and ultra-violet-visible-near-infrared spectroscopy measurements revealed the electronicproperties similar to those of bulk and thus the CFO films would be suitable to the investigation ofphotocathodic performance.

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