TY - JOUR
T1 - Highly oriented epitaxial CaFe2O4 thin films on TiO2 substrates grown by pulsed-laser deposition
AU - Nishiyama, Nana
AU - Mashiko, Hisanori
AU - Yoshimatsu, Kohei
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Ohtomo, Akira
N1 - Funding Information:
This work was partly supported by MEXT Elements Strategy Initiative to Form Core Research Center , MEXT Photon and Quantum Basic Research Coordinated Development Program , and a Grant-in-Aid for Scientific Research (No. 15H03881 ) from the Japan Society for the Promotion of Science Foundation. The work at KEK-PF was done under the approval of the Program Advisory Committee (Proposal No. 2013S2-002 and No. 2015G509). H. M. acknowledges financial support by JSPS Research Fellowships for Young Scientists and the Program for the MEXT Leading Graduate Schools “Academy for Correlative Education of Environment and Energy Science (ACEEES)”.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/9/30
Y1 - 2017/9/30
N2 - CaFe2O4 (CFO) is an oxide semiconductor being usable for a photocathode, but its single crystal is so far grown only by a high-pressure bulk synthesis method. Using pulsed-laser deposition, we have obtained the (010)-oriented CFO films on TiO2 (100) substrates. The epitaxial structure included twin domains with 1.5° tilting from the surface normal and sixfold domains with in-plane rotations of ± 70° with respect to the b axis of TiO2, which was explained by taking a number of probable arrangements between FeO6 and TiO6 octahedra into account. X-ray absorption spectroscopy and ultra-violet-visible-near-infrared spectroscopy measurements revealed the electronic properties similar to those of bulk and thus the CFO films would be suitable to the investigation of photocathodic performance.
AB - CaFe2O4 (CFO) is an oxide semiconductor being usable for a photocathode, but its single crystal is so far grown only by a high-pressure bulk synthesis method. Using pulsed-laser deposition, we have obtained the (010)-oriented CFO films on TiO2 (100) substrates. The epitaxial structure included twin domains with 1.5° tilting from the surface normal and sixfold domains with in-plane rotations of ± 70° with respect to the b axis of TiO2, which was explained by taking a number of probable arrangements between FeO6 and TiO6 octahedra into account. X-ray absorption spectroscopy and ultra-violet-visible-near-infrared spectroscopy measurements revealed the electronic properties similar to those of bulk and thus the CFO films would be suitable to the investigation of photocathodic performance.
KW - CaFeO
KW - Heteroepitaxy
KW - Pulsed-laser deposition
KW - X-ray absorption spectroscopy
KW - X-ray diffraction
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U2 - 10.1016/j.tsf.2017.08.003
DO - 10.1016/j.tsf.2017.08.003
M3 - Article
AN - SCOPUS:85027890053
SN - 0040-6090
VL - 638
SP - 406
EP - 409
JO - Thin Solid Films
JF - Thin Solid Films
ER -