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Structural control of self-assembled PbTiO3 nanoislands fabricated by metalorganic chemical vapor deposition

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6 Author(s)
Nonomura, Hajime ; Department of Electrical Engineering and Computer Sciences, Himeji Institute of Technology, 2167 Shosha, Himeji, Hyogo 671-2201, Japan ; Nagata, Masaki ; Fujisawa, Hironori ; Shimizu, M.
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Self-assembled PbTiO3 nanoislands of three different shapes with orderly in-plane directions were fabricated on Pt/SrTiO3 substrates by metalorganic chemical vapor deposition. The shapes of the nanoislands were triangular-shaped (width 50–110 nm, height 20–30 nm), triangular-prism-shaped (width 50–110 nm, length 100–550 nm, height 10–30 nm) and square-shaped (width 40–130 nm, height 4–10 nm) on Pt/SrTiO3(111), (101), and (001), respectively. The PbTiO3 nanoislands were epitaxially grown on the Pt/SrTiO3 substrates and consisted of {100} and {001} facets irrespective of the orientation of the substrates indicating that structural control of shape and in-plane direction of self-assembled PbTiO3 nanoislands can be achieved through epitaxial relations. The self-assembled PbTiO3 nanoislands with three different shapes were found to be ferroelectric by piezoresponse force microscopy.

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Applied Physics Letters  (Volume:86 ,  Issue: 16 )