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MECHANISM OF ELECTROFERROELECTRICITY AND d-p HYBRIDIZATION IN II-VI SEMICONDUCTOR ZnO

Research Project

Project/Area Number 12440078
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionHokkaido University

Principal Investigator

ONODERA Akira  Hokkaido Univ., Grad. School of Science, Prof., 大学院・理学研究科, 教授 (40142682)

Co-Investigator(Kenkyū-buntansha) SATOH Hiroyasu  Hakodate National College, Prof., 電子学科, 教授 (20149892)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥10,300,000 (Direct Cost: ¥10,300,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2000: ¥8,100,000 (Direct Cost: ¥8,100,000)
KeywordsSemiconductor / II-VI semiconductor / ferroelectric / d-p hybridization / electronic ferroelectricity / doping / electronic materials / zinc oxide
Research Abstract

It is well-known that II-VI semiconductor Zinc Oxide (ZnO) shows semiconducting nature. Recently, we discovered that ZnO exhibits novel ferroelectricity by small amount of Li substitution. In this study, we investigated the mechanism of this novel electronic ferroelectricity by means of dielectric measurements and X-ray diffraction. It has been explained that ferroelectricity is induced by displacements or ordering of ions or molecules in crystals. The ferroelectricity in ZnO is the first example to show ferroelectricity originated from some electronic origin, in contrast to the well-established understandings. It is confirmed Li dopants play an important role for the appearance of ferroelectricity. We investigated precise crystal structures both of ZnO and Li-doped ZnO at rom temperature and 19K. Analyses of crystal structures and electronic density by MEM clarified that 3d electrons transfer from the Zn site to bonding region. This evidence is also confirmed by calculations by DV-Xα method. Referring the theory of electronic ferroelectricity proposed by Sham et al, localized d-holes combine with some itinerant electrons located at the bonding region or p-electrons at oxygen, which results in this novel ferroelectricity in ZnO. Therefore this ferroelectricity is mainly related to changes of the d-p hybridization, not to structural changes described in te previous theory. This study has succeeded to show the new concept of electronic ferroelectricity in the condensed matter of physics.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (39 results)

All Other

All Publications (39 results)

  • [Publications] A.Onodera: "Novel Ferroelectricity in II-VI Semiconductor ZnO"Ferroelectrics. 267. 131-137 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yoshio, A.Onodera, H.Satoh, N.Sakagami, H.Yamashita: "Study of electronic Density in Ferroelectric-Li-doped ZnO at 19K by Maximum Entropy Method"Ferroelectrics. 270. 357-362 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Matsuki, J.Kimura, N.Sakagami, H.Satoh, A.Onodera: "Electron Spin Resonance of Fe^<3+> in ZnO Single Crystal"Ferroelectrics. 272. 181-185 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E.Islam, A.Sakai, A.Onodera: "Li-Concentration Dependence of Micro-Raman Spectra in Ferroelectric-Semiconductor Zn_<1-x>Li_xO"J. Phys. Soc. Jpn. 71. 1594-1597 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Onodera, W.Murata, K.Yoshio, H.Yamashita, T.Takama: "Ferroelectric Phase Transition in Layered Perovskite SrBi_2Ta_2O_9"Ferroelectrics. 270. 303-308 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Yamashita, K.Yoshio, W.Murata, A.Onodera: "Structural Changes and Ferroelectricity in Ferroelectric Bi-Layered SrBi_2Ta_2O_9"Jpn. J. Appl. Phys.. 41. 7076-7079 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Onodera: "Thermal Behavior and Phase Transition in PZT near Morphotropic Phase Boundary"Ferroelectrics (Special Issue on the 50th Anniversary of the Discovery of Antiferroelectricity in PbZrO_3). 269. 139-152 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Tanaka, K.Hironaka, A.Onodera: "Thermal Behavior of Ferroelectric Switching Properties of SBT Thin Films"Ferroelectrics (Special Issue on the 50th Anniversary of the Discovery of Antiferroelectricity in PbZrO_3). 269. 103-110 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yoshio, A.Onodera, H.Yamashita: "Ferroelectric Phase Transition and New Intermediate Phase in Bi-Layered Perovskite SrBi_2Ta_2O_9"Ferroelectrics. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yoshio, I.Matsubara, A.Sakai, H.Yamashita, A.Onodera: "Phase Transition in Ferroelectric SrBi_2Ta_2O_9 Single Crystal"J. Kor. Phys. Soc.. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A. Onodera: "Novel Ferroelectricity in Semiconducting ZnO"Ferrolectrics. 267. 131-137 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yoshio, A. Onodera, H. Satoh, N. Sakagami, H. Yamashita: "Study of Electronic Density in Ferroelectric Li-doped ZnO at 19K by Maximum Entropy Method"Ferroelectrics. 270. 357-362 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Matsuki, J. Kimura, N. Sakagami, H. Satoh, A. Onodera: "Electron Spin Resonance of Fe^<3+> in ZnO Single Crystal"Ferroelectrics. 272. 181-185 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E. Islam, A. Sakai, A.Onodera: "Li-Concentration Dependence of Micro-Raman Spectra in Ferroelectric-Semiconductor Zn^<1-x>Li_xO"J. Phys. Soc. Jpn. 71. 1594-1597 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A. Onodera, W. Murata, K. Yoshio, H. Yamashita, T. Takama: "Ferroelectric Phase Tarnsition in Layered Perovskite SrBi_2Ta_2O^9"Ferroelectrics. 270. 303-308 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Yamashita, K. Yoshio, W. Murata, A. Onodera: "Structural Changes and Ferroelectricity in Ferroelectric Bi-Layered SrBi_2Ta_2O_9"Jpn. J. Appl. Phys.. 41. 7076-7079 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A. Onodera, T. Yamazaki, H. Fujishita, Y. Ishikawa, M. Tanaka: "Thermal Behavior and Phase Transition in PZT near Morphotropic Phase Boundary"Ferroelectrics. 269(Special Issue on the 50th Anniversary of the Discovery of Antiferroelectric PbZrO_3). 139-152 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Tanaka, K. Hironaka, A. Onodera: "Thermal Behavior of Ferroelectric Switching Properties of SBT Thin Films"Ferroelectrics. 269(Special Issue on the 50th Anniversary of the Discovery of Antiferroelectric PbZrO_3). 103-110 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yoshio, A. Onodera, H. Yamashita: "Ferroelectric Phase Transition and New Intermediate Phase in Bi-Layered Perovskite SrBi_2Ta_2O_9"To be published in Ferroelectrics. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yoshio, I. Matsubara, A. Sakai, H. Yamashita, A. Onodera: "Phase Transition in Ferroelectric SrBi_2Ta_2O_9 Single Crystal"To be published in J. Kor. Phys.. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Onodera: "Novel Ferroelectricity in II-VI Semiconductor ZnO"Ferroelectrics. 267. 131-137 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Yoshio, A.Onodera, H.Satoh, N.Sakagami, H.Yamashita: "Study of Electronic Density in Ferroelectric-Li-doped ZnO at 19K by Maximum Entropy Method"Ferroelectrics. 270. 357-362 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Matsuki, J.Kimura, N.Sakagami, H.Satoh, A.Onodera: "Electron Spin Resonance of Fe^<3+> in ZnO Single Crystal"Ferroelectrics. 272. 181-185 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] E.Islam, A.Sakai, A.Onodera: "Li-Concentration Dependence of Micro-Raman Spectra in Ferroelectric-Semiconductor Zn_<1-x>Li_xO"J. Phys. Soc. Jpn. 71. 1594-1597 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Onodera, W.Murata, K.Yoshio, H.Yamashita, T.Takama: "Ferroelectric Phase Transition in Layered Perovskite SrBi_2Ta_2O_9"Ferroelectrics. 270. 303-308 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Yamashita, K.Yoshio, W.Murata, A.Onodera: "Structural Changes and Ferroelectricity in Ferroelectric Bi-Layered SrBi_2Ta_2O_9"Jpn. J. Appl. Phys.. 41. 7076-7079 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Onodera: "Novel Ferroelectricity in II-VI Semiconductor ZnO"Ferroelectrics. (in print). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] A. E.Islam, A.Sakai, A.Onodera: "Micro-Raman Scattering Study of Ferroelectric-Semiconductor Zn1-xLixO"Ferroelectrics. 261. 251-256 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Hagino, K.Yoshio, H.Satoh, M.Matsuki, A.Onodera: "Electronic Ferroelectricity in ZnO"Ferroelectrics. 264. 235-240 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Yoshio, H.Satoh, A.Onodera: "Crystal Structure of ZnO:Li at 293K and 19K by X-Ray Diffraction"Ferroelectrics. 264. 133-138 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Satoh, K.Yoshio, A.Onodera: "Effect of Cu-Doping on II-VI Semiconducting ZnO"Ferroelectrics. 264. 139-144 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Onodera, T.Yamazaki, H.Fujishita: "Thermal Behavior and Phase Transition in PZT near Morphotropic Phase Boundary"Ferroelectrics, Special issue on the 50^<th> Anniversary of the Discovery of Antiferroelectrics PbZrO3. 269(in print). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小野寺彰: "II-VI族半導体の強誘電性"固体物理. 35. 755-761 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Sakai 他: "Micro-Raman Scattering Spectra of Ferroelectric Zn1-xLixO"Ferroelectrics. 239. 133-140 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Hagino 他: "Electronic Ferroelectricity in ZnO"Ferroelectrics. (in print). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Yoshio 他: "Crystal Structure of ZnO : Li at 293K and 19K by X-Ray Diffraction"Ferroelectrics. (in print). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Satoh 他: "Effect of Cu-Doping on II-VI Semiconducting ZnO"Ferroelectrics. (in print). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] E.Islam 他: "Optical Phonons in Ferroelectric-Semiconductor Zn0.8Li0.2O Single Crystal Studied by Micro-Raman Scattering"J.Phys.Soc.Jpn. 70. 576-581 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Onodera 他: "Frontier Science Series : Ferroelectric Materials"Novel Ferroelectricity in Li-substituted ZnO. 30 (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2020-05-15  

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