Effect of Size Confinement on the Electronic States of CdS Cluster in a Germanium Oxide Matrix
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概要
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Change in the electronic state due to size confinement was studied for the CdS cluster embedded in GeO2 glass by photoacoustic, optical absorption and photoluminescence spectroscopies. The cluster size increases with increasing annealing temperature and time. The activation energy of ion diffusion during cluster growth is 0.45 eV. When the cluster size becomes less than about twice the exciton size, the energy bands become discrete. The energies of 1st and 2nd excited states increase with decreasing cluster size. The size dependence of the ist excited state determined experimentally coincides with the calculation. The energy of the surface state also shifts in parallel with the shift of the 1st excited state. When the cluster size decreases, the intensity of the edge emission decreases faster than that of the surface emission.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 1989-03-20
著者
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OGAWA Tsutomu
Institute for Applied Optics
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Arai Toshihiro
Institte For Optical Research Kyoiku University
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Fujumura Hidehiko
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305
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Umezu Ikuro
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305
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Fujii Americo
Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305
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