Structural determinants of the sign of the pyroelectric effect in quasi-amorphous SrTiO3 films

Victor Shelukhin, David Ehre, Etay Lavert, Ellen Wachtel, Yishay Feldman, Alexander Tagantsev, Igor Lubomirsky

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The magnitude and direction of the permanent electric polarization in the non-crystalline, polar phase (termed quasi-amorphous) of SrTiO3 in Si\SiO2\Me\SrTiO3\Me, (Me = Cr or W), Si\SrRuO 3\SrTiO3, and Si\SrTiO3 layered structures were investigated. Three potential sources of the polarization which appears after the material is pulled through a temperature gradient were considered: a) contact potential difference; b) a flexoelectric effect due to a strain gradient caused by substrate curvature; and c) a flexoelectric effect due to the thermally induced strain gradient that develops while pulling through the steep temperature gradient. Measurements show that options a) and b) can be eliminated from consideration. In most cases studied in this (Si\SrTiO3, Si\SiO2\Me\SrTiO3\Me, M = Cr or W) and previous works (Si\BaTiO3, Si\BaZrO3), the top surface of the quasi-amorphous phase acquires a negative charge upon heating. However, in Si\SrRuO3\SrTiO3 structures the top surface acquires a positive charge upon heating. On the basis of the difference in the measured expansion of the upper and lower surfaces of the SrTiO3 layer in the presence and absence of SrRuO3, we contend that the magnitude and direction of the pyroelectric effect are determined by the out-of-plane gradient of the in-plane strain in the SrTiO3 layer while pulling through the temperature gradient.

Original languageEnglish
Pages (from-to)1403-1410
Number of pages8
JournalAdvanced Functional Materials
Volume21
Issue number8
DOIs
Publication statusPublished - Apr 22 2011

Fingerprint

Amorphous films
determinants
Thermal gradients
temperature gradients
pulling
gradients
Polarization
Heating
contact potentials
heating
plane strain
polarization
curvature
expansion
Substrates
strontium titanium oxide

Keywords

  • Electric polarization
  • Flexoelectric effect
  • Quasi-amorphous
  • SrTiO
  • Thin films

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Structural determinants of the sign of the pyroelectric effect in quasi-amorphous SrTiO3 films. / Shelukhin, Victor; Ehre, David; Lavert, Etay; Wachtel, Ellen; Feldman, Yishay; Tagantsev, Alexander; Lubomirsky, Igor.

In: Advanced Functional Materials, Vol. 21, No. 8, 22.04.2011, p. 1403-1410.

Research output: Contribution to journalArticle

Shelukhin, Victor ; Ehre, David ; Lavert, Etay ; Wachtel, Ellen ; Feldman, Yishay ; Tagantsev, Alexander ; Lubomirsky, Igor. / Structural determinants of the sign of the pyroelectric effect in quasi-amorphous SrTiO3 films. In: Advanced Functional Materials. 2011 ; Vol. 21, No. 8. pp. 1403-1410.
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AU - Tagantsev, Alexander

AU - Lubomirsky, Igor

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N2 - The magnitude and direction of the permanent electric polarization in the non-crystalline, polar phase (termed quasi-amorphous) of SrTiO3 in Si\SiO2\Me\SrTiO3\Me, (Me = Cr or W), Si\SrRuO 3\SrTiO3, and Si\SrTiO3 layered structures were investigated. Three potential sources of the polarization which appears after the material is pulled through a temperature gradient were considered: a) contact potential difference; b) a flexoelectric effect due to a strain gradient caused by substrate curvature; and c) a flexoelectric effect due to the thermally induced strain gradient that develops while pulling through the steep temperature gradient. Measurements show that options a) and b) can be eliminated from consideration. In most cases studied in this (Si\SrTiO3, Si\SiO2\Me\SrTiO3\Me, M = Cr or W) and previous works (Si\BaTiO3, Si\BaZrO3), the top surface of the quasi-amorphous phase acquires a negative charge upon heating. However, in Si\SrRuO3\SrTiO3 structures the top surface acquires a positive charge upon heating. On the basis of the difference in the measured expansion of the upper and lower surfaces of the SrTiO3 layer in the presence and absence of SrRuO3, we contend that the magnitude and direction of the pyroelectric effect are determined by the out-of-plane gradient of the in-plane strain in the SrTiO3 layer while pulling through the temperature gradient.

AB - The magnitude and direction of the permanent electric polarization in the non-crystalline, polar phase (termed quasi-amorphous) of SrTiO3 in Si\SiO2\Me\SrTiO3\Me, (Me = Cr or W), Si\SrRuO 3\SrTiO3, and Si\SrTiO3 layered structures were investigated. Three potential sources of the polarization which appears after the material is pulled through a temperature gradient were considered: a) contact potential difference; b) a flexoelectric effect due to a strain gradient caused by substrate curvature; and c) a flexoelectric effect due to the thermally induced strain gradient that develops while pulling through the steep temperature gradient. Measurements show that options a) and b) can be eliminated from consideration. In most cases studied in this (Si\SrTiO3, Si\SiO2\Me\SrTiO3\Me, M = Cr or W) and previous works (Si\BaTiO3, Si\BaZrO3), the top surface of the quasi-amorphous phase acquires a negative charge upon heating. However, in Si\SrRuO3\SrTiO3 structures the top surface acquires a positive charge upon heating. On the basis of the difference in the measured expansion of the upper and lower surfaces of the SrTiO3 layer in the presence and absence of SrRuO3, we contend that the magnitude and direction of the pyroelectric effect are determined by the out-of-plane gradient of the in-plane strain in the SrTiO3 layer while pulling through the temperature gradient.

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