Effect of LaNiO3 interlayer on dielectric properties of (Ba0.5Sr0.5)TiO3 thin films deposited on differently oriented Pt electrodes

Effect of LaNiO3 interlayer on dielectric properties of (Ba0.5Sr0.5)TiO3 thin films deposited on differently oriented Pt electrodes

The (Ba0.5Sr0.5)TiO3 (BST) thin films were deposited on the LaNiO3/Pt(111)/Ti/SiO2/Si [LNO/Pt(111)] and LaNiO3/Pt(200)/SiO2/Si [LNO/Pt(200)] substrates by metalorganic deposition process. The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the...

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Veröffentlicht in:Applied physics letters 2002-12, Vol.81 (26), p.5012-5014
Hauptverfasser: Yoon, Ki Hyun, Sohn, Ji-Hoon, Lee, Byoung Duk, Kang, Dong Heon
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container_end_page 5014
container_issue 26
container_start_page 5012
container_title Applied physics letters
container_volume 81
creator Yoon, Ki Hyun
Sohn, Ji-Hoon
Lee, Byoung Duk
Kang, Dong Heon
description The (Ba0.5Sr0.5)TiO3 (BST) thin films were deposited on the LaNiO3/Pt(111)/Ti/SiO2/Si [LNO/Pt(111)] and LaNiO3/Pt(200)/SiO2/Si [LNO/Pt(200)] substrates by metalorganic deposition process. The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the LNO/Pt(111) substrates, the BST film was also randomly oriented, but the insertion of LNO interlayer on the Pt(200) substrates caused the growth of (100) textured BST films. The dielectric constant of the 350-nm-thick BST films on LNO/Pt(200) was around 400, which was higher than that of the films on LNO/Pt(111) (around 340). This result was attributed to the fact that the polar axis of the (100) oriented film was more tilted away from the normal to the film surface than that of randomly oriented film. Also, the tunabilities of BST films deposited on the LNO/Pt(200) and LNO/Pt(111) substrates were nearly 60% and 51% at the applied electric field of 400 kV/cm, respectively. Improved tunability has been attributed to the (100) texture of the film leading to an enhancement of the in-plane oriented polar axis.
doi_str_mv 10.1063/1.1531218
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The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the LNO/Pt(111) substrates, the BST film was also randomly oriented, but the insertion of LNO interlayer on the Pt(200) substrates caused the growth of (100) textured BST films. The dielectric constant of the 350-nm-thick BST films on LNO/Pt(200) was around 400, which was higher than that of the films on LNO/Pt(111) (around 340). This result was attributed to the fact that the polar axis of the (100) oriented film was more tilted away from the normal to the film surface than that of randomly oriented film. Also, the tunabilities of BST films deposited on the LNO/Pt(200) and LNO/Pt(111) substrates were nearly 60% and 51% at the applied electric field of 400 kV/cm, respectively. 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The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the LNO/Pt(111) substrates, the BST film was also randomly oriented, but the insertion of LNO interlayer on the Pt(200) substrates caused the growth of (100) textured BST films. The dielectric constant of the 350-nm-thick BST films on LNO/Pt(200) was around 400, which was higher than that of the films on LNO/Pt(111) (around 340). This result was attributed to the fact that the polar axis of the (100) oriented film was more tilted away from the normal to the film surface than that of randomly oriented film. Also, the tunabilities of BST films deposited on the LNO/Pt(200) and LNO/Pt(111) substrates were nearly 60% and 51% at the applied electric field of 400 kV/cm, respectively. 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The BST films directly grown on the Pt(200) and Pt(111) substrates exhibited random orientation. In case of the LNO/Pt(111) substrates, the BST film was also randomly oriented, but the insertion of LNO interlayer on the Pt(200) substrates caused the growth of (100) textured BST films. The dielectric constant of the 350-nm-thick BST films on LNO/Pt(200) was around 400, which was higher than that of the films on LNO/Pt(111) (around 340). This result was attributed to the fact that the polar axis of the (100) oriented film was more tilted away from the normal to the film surface than that of randomly oriented film. Also, the tunabilities of BST films deposited on the LNO/Pt(200) and LNO/Pt(111) substrates were nearly 60% and 51% at the applied electric field of 400 kV/cm, respectively. Improved tunability has been attributed to the (100) texture of the film leading to an enhancement of the in-plane oriented polar axis.</abstract><doi>10.1063/1.1531218</doi><tpages>3</tpages></addata></record>
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title Effect of LaNiO3 interlayer on dielectric properties of (Ba0.5Sr0.5)TiO3 thin films deposited on differently oriented Pt electrodes
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