Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses

Among the various dielectric materials, barium strontium titanate has been extensively studied due to its high dielectric constant, low dielectric loss and high tunability. Barium strontium titanate is a composition dependent to Curie temperature, which decreases linearly with the increasing of S...

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Main Author:	Nurhafizah, Ramli
Format:	Thesis
Language:	English
Subjects:	Barium strontium titanate (BST) Thin films Ferroelectricity Solution deposition Composition
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/2/Full%20text.pdf
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spelling	my-unimap-324222014-03-07T08:55:09Z Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses Nurhafizah, Ramli Among the various dielectric materials, barium strontium titanate has been extensively studied due to its high dielectric constant, low dielectric loss and high tunability. Barium strontium titanate is a composition dependent to Curie temperature, which decreases linearly with the increasing of Sr amount in the composition. In this study, barium strontium titanate thin films with four different compositions; Ba0.5Sr0.5TiO3, Ba0.6Sr0.4TiO3, Ba0.7Sr0.3TiO3 and Ba0.8Sr0.2TiO3 and four different thicknesses were prepared by using sol-gel technique and deposited on Pt/SiO2/Si substrates. The wellcrystallized,dense, smooth and crack-free thin films are obtained through annealing process at temperature of 800 C. The dielectric constant, tunability and dielectric loss shows strong relationship with the films microstructure. The dielectric constant, tunability and dielectric loss increases as the grain size and film thickness increases. The variations of dielectric constant as a function of voltage for Ba0.5Sr0.5TiO3 and Ba0.6Sr0.4TiO3 thin films are devoid of any spontaneous polarization, which indicates that the thin film is paraelectric in room temperature. However, Ba0.7Sr0.3TiO3 and Ba0.8Sr0.2TiO3 thin films with butterflyshaped curves show the existence of ferroelectric nature. The highest dielectric constant and tunability, 485.02 and 34.75 % were observed in Ba0.7Sr0.3TiO3 composition at thickness of 447.6 nm due to the Curie temperature of Ba0.7Sr0.3TiO3 is close to room temperature. This work demonstrates successful physical and electrical characterization of multiple layers of BaxSr1-xTiO3 thin films to its different composition ratios of Ba and Sr. Universiti Malaysia Perlis (UniMAP) 2011 Thesis en http://dspace.unimap.edu.my:80/dspace/handle/123456789/32422 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/1/Page%201-24.pdf 8574b31b83c7ae07924e59e582d64d00 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/2/Full%20text.pdf 1b65c53f15d229ebba23c78c24b3c2bc http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 Barium strontium titanate (BST) Thin films Ferroelectricity Solution deposition Composition School of Microelectronic Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
topic	Barium strontium titanate (BST) Thin films Ferroelectricity Solution deposition Composition
spellingShingle	Barium strontium titanate (BST) Thin films Ferroelectricity Solution deposition Composition Nurhafizah, Ramli Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
description	Among the various dielectric materials, barium strontium titanate has been extensively studied due to its high dielectric constant, low dielectric loss and high tunability. Barium strontium titanate is a composition dependent to Curie temperature, which decreases linearly with the increasing of Sr amount in the composition. In this study, barium strontium titanate thin films with four different compositions; Ba0.5Sr0.5TiO3, Ba0.6Sr0.4TiO3, Ba0.7Sr0.3TiO3 and Ba0.8Sr0.2TiO3 and four different thicknesses were prepared by using sol-gel technique and deposited on Pt/SiO2/Si substrates. The wellcrystallized,dense, smooth and crack-free thin films are obtained through annealing process at temperature of 800 C. The dielectric constant, tunability and dielectric loss shows strong relationship with the films microstructure. The dielectric constant, tunability and dielectric loss increases as the grain size and film thickness increases. The variations of dielectric constant as a function of voltage for Ba0.5Sr0.5TiO3 and Ba0.6Sr0.4TiO3 thin films are devoid of any spontaneous polarization, which indicates that the thin film is paraelectric in room temperature. However, Ba0.7Sr0.3TiO3 and Ba0.8Sr0.2TiO3 thin films with butterflyshaped curves show the existence of ferroelectric nature. The highest dielectric constant and tunability, 485.02 and 34.75 % were observed in Ba0.7Sr0.3TiO3 composition at thickness of 447.6 nm due to the Curie temperature of Ba0.7Sr0.3TiO3 is close to room temperature. This work demonstrates successful physical and electrical characterization of multiple layers of BaxSr1-xTiO3 thin films to its different composition ratios of Ba and Sr.
format	Thesis
author	Nurhafizah, Ramli
author_facet	Nurhafizah, Ramli
author_sort	Nurhafizah, Ramli
title	Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
title_short	Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
title_full	Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
title_fullStr	Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
title_full_unstemmed	Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses
title_sort	physical and electrical characterization of sol-gel derived baxsr1-xtio3 thin films of various composition ratios and thicknesses
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Microelectronic Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/32422/2/Full%20text.pdf
_version_	1747836800116719616

Physical and electrical characterization of sol-gel derived BaxSr1-xTiO3 thin films of various composition ratios and thicknesses

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