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One-axis Oriented CaBi4Ti4O15 and SrBi4Ti4O15 Films Prepared on Silicon Wafer by Chemical Solution Deposition Technique

Published online by Cambridge University Press:  31 January 2011

Yuki Mizutani ,
Hiroshi Uchida ,
Hiroshi Funakubo  and
Seiichiro Koda
Yuki Mizutani
Affiliation:
mizuta-y@sophia.ac.jp, Sophia University, Department of Materials and Life Science, Tokyo, Japan
Hiroshi Uchida
Affiliation:
uchidah@sophia.ac.jp, Sophia University, Department of Materials and Life Science, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan, +81-3-323–3375, +81-3-3238-3361
Hiroshi Funakubo
Affiliation:
funakubo@iem.titech.ac.jp, Tokyo Institute of Technology, Yokohama, Japan
Seiichiro Koda
Affiliation:
koda@sophia.ac.jp, Sophia University, Department of Materials and Life Science, Tokyo, Japan
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Abstract

One-axis oriented bismuth layer-structured dielectric (BLSD) films were designed using perovskite buffer layers for assembling the crystal orientation and the dielectric properties of the BLSD crystals on silicon wafer. The BLSD crystals with the general formula of (Bi2O2)2+-(Am-1BmO3m+1)2- possess excellent dielectric permittivity with lower size effect and temperature coefficient of capacitance (TCC), as well as high electrical resistivity along to the c-axis direction. These phenomena would contribute for constructing high performance dielectric devices driven under harsh environment, e.g., at high-temperature condition above 100°C. In this study, thin films of CaBi4Ti4O15 and SrBi4Ti4O15, kinds of BLSD compounds with the number of BO6 octahedra in pseudo-perovskite blocks, m, = 4, were prepared by chemical solution deposition (CSD) technique on (100)LaNiO3/(111)Pt/TiO2/(100)Si and (100)SrRuO3// (100)LaNiO3/(111)Pt/TiO2/(100)Si substrates. These films consisted of crystalline phase of BLSD crystal with preferential crystal orientation of (001) plane normal to the substrate surface. Anisotropic crystal growth of BLSD occurred by the lattice matching between pseudo-perovskite blocks in BLSD crystal and (100)LaNiO3 or (100)SrRuO3 plane with perovskite structure. The dielectric constants (εr) of (001)-plane oriented CaBi4Ti4O15 and SrBi4Ti4O15 films were approximately 250-350 at room temperature. The r values of the CaBi4Ti4O15 and SrBi4Ti4O15 films increased slightly with ambient temperature. The TCCs at a temperature range from 25 to 200°C were approximately +103 - +514 ppm/K respectively, which were significantly different from those of (Ba,Sr)TiO3 thin films and would satisfy the performance requirement for driving at high-temperature condition.

Keywords

dielectricthin filmsol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1199: Symposium F –Multiferroic and Ferroelectric Materials , 2009 , 1199-F03-14
Copyright
Copyright © Materials Research Society 2010

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