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Low-temperature ultraviolet sol-gel photoannealing processing of multifunctional lead-titanate-based thin films

Published online by Cambridge University Press:  31 January 2011

M.L. Calzada ,
I. Bretos ,
R. Jiménez ,
H. Guillon ,
J. Ricote  and
L. Pardo
M.L. Calzada*
Affiliation:
Instituto Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049–Madrid, Spain
I. Bretos
Affiliation:
Instituto Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049–Madrid, Spain
R. Jiménez
Affiliation:
Instituto Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049–Madrid, Spain
H. Guillon
Affiliation:
KEMSTREAM, Advanced Vaporizers, Rue de la vieille poste, PIT de la Pompignane, Batiment T2, 34055 Montpellier, Cedex 1, France
J. Ricote
Affiliation:
Instituto Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049–Madrid, Spain
L. Pardo
Affiliation:
Instituto Ciencia de Materiales de Madrid (CSIC), Cantoblanco, 28049–Madrid, Spain
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

(Pb1−xCax)TiO3 perovskite thin films with nominal compositions of (Pb0.76Ca.24)TiO3 (ferroelectric) and (Pb0.50Ca0.50)TiO3 (relaxor-ferroelectric) were prepared on silicon substrates at low temperatures compatible with those used in Si-technology. The technique used for the processing of these films was ultraviolet (UV) sol-gel photoannealing, using photo-sensitive precursor solutions and UV-assisted rapid thermal processing. The UV-irradiation and thermal treatment of the solution-derived films (gel films) were carried out in air or in oxygen. In both cases, the formation of the perovskite occurred at the same temperature, and this temperature increased as the Ca2+ content increased. Thus, full-perovskite films of (Pb0.76Ca.24)TiO3 were obtained at 723 K whereas those of (Pb0.50Ca0.50)TiO3 were formed at 773 K. Well-defined ferroelectric hysteresis loops were measured in the (Pb0.76Ca.24)TiO3 films, with values of remanent polarization of Pr ∼ 11 μC cm−2 and coercive fields for the films processed in oxygen lower than those of the films processed in air, Ec ∼ 164 and ∼226 kV.cm−1, respectively. These films showed a ferro-paraelectric transition at close temperatures of Tmax ∼ 605 K, although with higher values of the permittivity for the film processed in oxygen, k ∼ 567 at 10 kHz. The (Pb0.50Ca.50)TiO3 films had a diffuse ferro-paraelectric transition with a relaxor-like character, also with higher k values for the films prepared in oxygen, k ∼ 179 at Tmax ∼ 20 K. The possible use of these materials in silicon integrated multifunctional devices is discussed in this paper.

Keywords

FilmPhotochemicalSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 1824 - 1833
Copyright
Copyright © Materials Research Society 2007

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