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Low Temperature Growth Of Barium Strontium Titanate Films By Ultraviolet-Assisted Pulsed Laser Deposition

Published online by Cambridge University Press:  10 February 2011

V. Craciun ,
J. M. Howard ,
E. S. Lambers  and
R. K. Singh
V. Craciun
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
J. M. Howard
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
E. S. Lambers
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
R. K. Singh
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
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Abstract

Barium strontium titanate (BST) thin films were grown directly on Si substrates by an in situ ultraviolet (UV)-assisted pulsed laser deposition (UVPLD) technique. With respect to films grown by conventional (i.e. without UV illumination) pulsed laser deposition (PLD), the UVPLD grown films exhibited improved structural and electrical properties. The dielectric constant of a 40-nm thick film deposited at 650 °C was determined to be 281, the leakage current density was approximately 4×10−8 A/cm2at 100 kV/cm, and the density of interface states at the flat-band voltage was found to be approximately 5.6×1011 eV−1 cm−2 X-ray photoelectron spectroscopy investigations found that the surface of the grown films exhibited an additional Ba-containing phase, besides the usual BST perovskite phase, which was likely caused by stress and/or oxygen vacancies. The amount of this new phase was always smaller and very superficial for UVPLD grown films, which can explain their better overall properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 617: Symposium J – Laser-Solid Interactionsfor Materials Processing , 2000 , J3.21
Copyright
Copyright © Materials Research Society 2000

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