Effects of deposition conditions on the ferroelectric properties of (Al1−xScx)N thin films

The ferroelectricity of (Al1−xScx)N (x = 0–0.34) thin films with various thicknesses was investigated. (Al1−xScx)N films were prepared at 400 °C on (111)Pt/TiOx/SiO2/(001)Si substrates by the radio frequency dual-source reactive magnetron sputtering method using Al and Sc targets under pure N2 gas o...

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Published inJournal of applied physics Vol. 128; no. 11
Main Authors Yasuoka, Shinnosuke, Shimizu, Takao, Tateyama, Akinori, Uehara, Masato, Yamada, Hiroshi, Akiyama, Morito, Hiranaga, Yoshiomi, Cho, Yasuo, Funakubo, Hiroshi
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 21.09.2020
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Abstract The ferroelectricity of (Al1−xScx)N (x = 0–0.34) thin films with various thicknesses was investigated. (Al1−xScx)N films were prepared at 400 °C on (111)Pt/TiOx/SiO2/(001)Si substrates by the radio frequency dual-source reactive magnetron sputtering method using Al and Sc targets under pure N2 gas or a mixture of N2 and Ar gases. The film deposited under N2 gas showed larger remanent polarization than those under N2 + Ar mixture. Ferroelectricity was observed for films with x = 0.10–0.34 for about 140-nm-thick films deposited under N2 gas. The x = 0.22 films showed ferroelectricity down to 48 nm in thickness from the polarization–electric field curves and the positive-up-negative-down measurement. The ferroelectricity of the 9 nm-thick film also was ascertained from scanning nonlinear dielectric microscopy measurement. These results reveal that ferroelectric polarization can switch for films with much broader compositions and thicknesses than those in the previous study.
AbstractList The ferroelectricity of (Al1−xScx)N (x = 0–0.34) thin films with various thicknesses was investigated. (Al1−xScx)N films were prepared at 400 °C on (111)Pt/TiOx/SiO2/(001)Si substrates by the radio frequency dual-source reactive magnetron sputtering method using Al and Sc targets under pure N2 gas or a mixture of N2 and Ar gases. The film deposited under N2 gas showed larger remanent polarization than those under N2 + Ar mixture. Ferroelectricity was observed for films with x = 0.10–0.34 for about 140-nm-thick films deposited under N2 gas. The x = 0.22 films showed ferroelectricity down to 48 nm in thickness from the polarization–electric field curves and the positive-up-negative-down measurement. The ferroelectricity of the 9 nm-thick film also was ascertained from scanning nonlinear dielectric microscopy measurement. These results reveal that ferroelectric polarization can switch for films with much broader compositions and thicknesses than those in the previous study.
Author Yasuoka, Shinnosuke
Tateyama, Akinori
Akiyama, Morito
Yamada, Hiroshi
Shimizu, Takao
Uehara, Masato
Hiranaga, Yoshiomi
Cho, Yasuo
Funakubo, Hiroshi
Author_xml – sequence: 1
  givenname: Shinnosuke
  surname: Yasuoka
  fullname: Yasuoka, Shinnosuke
  organization: Department of Materials Science and Engineering, Tokyo Institute of Technology
– sequence: 2
  givenname: Takao
  surname: Shimizu
  fullname: Shimizu, Takao
  organization: 5Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8502, Japan
– sequence: 3
  givenname: Akinori
  surname: Tateyama
  fullname: Tateyama, Akinori
  organization: Department of Materials Science and Engineering, Tokyo Institute of Technology
– sequence: 4
  givenname: Masato
  surname: Uehara
  fullname: Uehara, Masato
  organization: Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST)
– sequence: 5
  givenname: Hiroshi
  surname: Yamada
  fullname: Yamada, Hiroshi
  organization: Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST)
– sequence: 6
  givenname: Morito
  surname: Akiyama
  fullname: Akiyama, Morito
  organization: Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST)
– sequence: 7
  givenname: Yoshiomi
  surname: Hiranaga
  fullname: Hiranaga, Yoshiomi
  organization: Research Institute of Electrical Communication, Tohoku University
– sequence: 8
  givenname: Yasuo
  surname: Cho
  fullname: Cho, Yasuo
  organization: Research Institute of Electrical Communication, Tohoku University
– sequence: 9
  givenname: Hiroshi
  surname: Funakubo
  fullname: Funakubo, Hiroshi
  organization: 5Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8502, Japan
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Snippet The ferroelectricity of (Al1−xScx)N (x = 0–0.34) thin films with various thicknesses was investigated. (Al1−xScx)N films were prepared at 400 °C on...
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SubjectTerms Applied physics
Electric fields
Ferroelectric materials
Ferroelectricity
Gases
Magnetron sputtering
Polarization
Silicon dioxide
Silicon substrates
Thick films
Thickness
Thin films
Titanium oxides
Title Effects of deposition conditions on the ferroelectric properties of (Al1−xScx)N thin films
URI http://dx.doi.org/10.1063/5.0015281
https://www.proquest.com/docview/2443945446
Volume 128
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