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1989 Fiscal Year Final Research Report Summary

Quantum Well Effects in Ionic Insulators and Metals.

Research Project

Project/Area Number 63460028
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionDepartment of pure and applied sciences, University of Tokyo.

Principal Investigator

EJIRI Arisato  Dept. of pure and applied sciences, Univ. of Tokyo, Assistant., 教養学部, 助手 (70012383)

Co-Investigator(Kenkyū-buntansha) NASU Takao  College of Arts and Sciences. Univ. of Tokyo. Assistant Professor., 教養学部, 助教授 (60012374)
HATANO Akira  Dept. of pure and applied sciences, Univ. of Tokyo, Assistant., 教養学部, 助手 (10012395)
NAKAGAWA Kazumiti  Faculty of Education, Kobe University, Assistant Professor., 教育学部, 助教授 (00134403)
Project Period (FY) 1988 – 1989
KeywordsAlkali halide multilayer structures. / Quantum well excitons. / Confinement effect. / Interface mixture. / Interface mismatch. / Exciton in the well-layer. / Exciton in the barrier-layer. / Characterization of multilayer structure.
Research Abstract

After discovery of the quantum size effect in the KBr exciton band on the absorption spectra of alternate KCI-KBr multilayer structure in 1986, we have mainly investigated the quantum well excitons in several alkali halides and accumulated lots of knowledges on them. These knowledges are briefly explained as the follows.
The exciton band due to the well (KBr) which appears at the lowest energy on the absorption spectra of KCI-KBr or RbCl-xBr multilayer structures exhibits a blueshift in affecting with two effects, namely an increase of the exciton kinetic due to quantum confinement and an increase of band gap in the well due to interface mixture formation. Whereas the confinement of exciton wave function is effectively occurred even in the well with width wider by ten times of exciton Bohr radius and seems to make the rise of exciton band steeper appreciably.
The influence of the layer-layer interface mixture to the blueshift which is remarkable in the noannealed multilayer can be decreased by thermal annealing at appropriate temperature for layer by layer, and an interface mismatch free and interface mixture free structure is realized in annealed RbCl-KBr multilayer. The.interface mixture formation strongly depends on annealing temperature and evaporation, speed, and at the present, it is considered that the temperature 180゚-200゚ C and the speed less than 1A^^゚/sec are favorable.
It is also revealed that, if.there is a large difference of lattice constant between the layer and the substrate crystal, the interface mismatch effect is important in the case of very thin film less than 100A^^゚.
The experimental chamber which is just constructed by the grant will be worked to research the conditions of the thermal annealing and the evaporation speed of thin layers in near future.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 江尻有郷、中川和道: "Quantum Well Excitons in RbCl-KBr and KCl-KBr Multilayer Structures" Activity Report of Synchrotron Radiation Laboratory.ISSP.The University of Tokyo. 1988. 19-20 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道: "Absorption Spectra of Quantum Well Exciton in Alkali Hlide Multilayer Structures" UVSOR Activity Report.UVSOR.Institute for Molecular Science. 1988. 42-43 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道: "Optical Absorption Spectra of Exciton in Very Thin KCl-KBr Multilayer Structures" J.Phys.Soc.Jpn.58. 2669-2672 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道、波田野彰: "Absorption Spectra of Quantum Well Exciton in Alkali Halide Multilayer Structures" Physica Scripta. 41. 95-98 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道: "Absorption Spectra of Quantum Well Exciton in RbCl-KBr Multilayer Structures" Solid State Commun.in press. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道、波田野彰: "Interface Mixture Effects on the Quantum Well Exciton in KCl-KBr Multilayer Structures" Activity Report of Synchrotron Radiation Laboratory ISSP.The University of Tokyo.(in press)(発行予定). 1989. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江尻有郷、中川和道、波田野彰: "Absorption Spectra of Quantum Well Exciton in annealed RbCl-KBr Multilayer Structures" Activity Report of Synchrotron Radiation Laboratory ISSP.The University of Tokyo.(in press). 1989. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Ejiri, K.Nakagawa, T.Tamegai, Y.Nogami, and K.Kubo: "Size Effects of Exciton in Super-Thin Film of Potassium Bromide." Act. Rep. of Synchr. Rad. Lab. ISSP, Univ. of Tokyo, 25-26,(1986).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri and K.Nakagawa: "Quantum Well Excitons in RbCl-KBr and KCl-KBr Multilayer Structures." Act. Rep. of Synchr. Rad. Lab. ISSP, Univ. of Tokyo, 19-20,(1988).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri and K.Nakagawa: "Absorption Spectra of Quantum Well Exciton in Alkali Hlide Multilayer Structures." Act. Rep. of UVSOR, Institute for Molecular Science 42-43 1988.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri and K.Nakagawa: "Optical Absorption Spectra of Excitons in Very Thin KCl-KBr Multilayer Structures." J. Phys. Soc. Jpn. 58 2669-2672, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri, K.Nakagawa and A.Hatano: "Absorption Spectra of Quantum Well Exciton in Alkali Halide Multilayer Structures;" Physica Scripta 41 95-98 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri and K.Nakagawa: "Absorption Spectra of Quantum Well Exciton in RbCl-KBr Multilayer Structures;" Solid State Commun. 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri, K.Nakagawa and A.Hatano: "Interface MixtureEffects on the Quantum Well Exciton in KCl-KBr Multilayer Structures." Act. Rep. of SRL-ISSP The University of Tokyo 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri, K.Nakagawa and A.Hatano: "Absorption Spectra of Quantum Well Exciton in annealed RbCl-KBr Multilayer Structures." Act. Rep. of SRL-ISSP The University of Tokyo 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ejiri, K.Nakagawa and A.Hatano: "Optical Studies of Quantum Well Exciton in Alkali Halide Multilayer structures; (in japanese)" to be submitted to Bunkou Kenkyuu 1990.

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

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Published: 1993-03-26  

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