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1999 Fiscal Year Final Research Report Summary

STUDY OF EXCITONIC PROPETIES OF LOW-DIMENSINAL ZnO

Research Project

Project/Area Number 10650024
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionIshinomaki Senshu University

Principal Investigator

YASUDA Takashi  ISHINOMAKI SENSHU UNIVERSITY, 理工学部, 助教授 (90182336)

Co-Investigator(Kenkyū-buntansha) SEGAWA Yusaburo  ISHINOMAKI SENSHU UNIVERSITY, フォトダイナミクス研究センター, チームリーダー (30087473)
Project Period (FY) 1998 – 1999
KeywordsZnO / MgZnO / Quantum Well / Photoluminescence / Exciton / Ultla-Violet Laser / Oxide
Research Abstract

High quality epitaxial layers of ZnO were successfully grown by laser MBE, which attracts much attention for new ultra-violet semiconductor lasers. For the fabrications of laser structures, development of cladding materials with larger bandgap than ZnO is important in this material system. Incorporation of Mg into ZnO up to 20% was successfully achieved using laser MBE, resulting in the increase of bandgap. Multi-quantum wells (MQWs) structures of ZnO/MgZnO were grown on sapphire substrates to observe the carrier confinement effects. The periodic structures with the order of lOnm in sizes were confirmed by a x-ray diffraction measurement as well as a transmission electron microscope observation. The minimum well width achieved in this study was about 1 nm. Low temperature photoluminescence(PL) and photoluminescence excitation(PLE) were performed to investigate the quantized electronic states in these structures. Blue shift of PL emission peaks as well as PLE absorption peaks were observed by decreasing the well width, which is in good agreement with the calculations based on quantum well structures. The large stokes shift between PL and PLE peaks exhibits that the localized excitons play an important role in these NIQWs, which was also confirmed from the result of temperature dependence of PL measurement.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] A. Ohtomo: "Double Heterostructure Based on ZnO and Mg_XMgZn_<1-X>O"Materials Science Forum. 264-268. 1463-1466 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Ohtomo: "Mg_XMgZn_<1-X>O as a II-VI widegap semiconductor alloy"Appl. Phys. Lett.. 72. 2466-2468 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Ohtomo: "Fabrication of alloys and superlatives based on ZnO towards ultraviolet laser"Materials Science and Engineering. 1356. 263-266 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Yasuda: "Fabrication of Quantum Structures in Wide-Gap II-VI semiconductors"Electronics and Communications in Japan Part 2. 82. 24-32 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A Ohtomo: "Structure and Optical properties of ZnO/Mg_XMgZn_<1-X>O superlatives"Appl. Phys. Lett.. 75. 980-982 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Makino: "Optical spectra in ZnO thin films on lattice-matched substrates grown with laser-MBF method"J. Cryst. Growth. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Ohtomo, M.Kawasaki, T.Koida, H.Koinuma, Y. Sakurai,Y.Yoshida, M.Sumiya, S.Fuke,T.Yasuda, Y.Segawa: "Double Heterostructure Based on ZnO and MgィイD2xィエD2ZnィイD21-xィエD2O"Materials Science Forum. Vols264-268. 1463-1466 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ohtomo, M.Kawasaki, T.Koida, K.Masubuchi, H.Koinuma, Y.Sakurai, Y.Yoshida, T.Tasuda, Y.Segawa: "MgィイD2xィエD2ZnィイD21-xィエD2O as a II-VI widegap semiconductor alloy"Appi.Phys. Lett.. 72. 2466-2468 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ohtomo,M.Kawasaki, Y.Sakurai,I.Ohkubo,R.Shiroki,Y.Yoshida, T.Yasuda, Y.Segawa,H.Koinuma: "Fabrication of alioys and superlattices based on ZnO towards ultraviolet laser"Materials Science and Engineering. B56. 263-266 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Yasuda, Baoping Zhang and Yusaburo Segawa: "Fabrication of Quantum Structures in Wide-Gap Il-NI Semiconductors"Electronics and Communications in Japan, Part2. 82. 24-32 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ohtomo, M. Kawasaki, I.Ohkubo, H.Koinuma, T.Yasuda and Y.Segawa: "Structure and optical properties of ZnO/MgィイD20.2ィエD2ZnィイD20.8ィエD2O superlattices"Appl.Phys.. 75. 980-982 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Makino, G.Isoya, Y.Segawa, H.Chia, T.Yasuda, M.Kawasaki, A.Ohtomo, K.Tamura, and H.Koinuma: "Optical spectra in ZnO thin films on lattice-matched substrates grown with laser-MBE method"J.Cryst.Growth.. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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