| Project/Area Number |
21560017
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Wakayama University |
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Principal Investigator |
SHINOZUKA Yuzo 和歌山大学, システム工学部, 教授 (30144918)
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| Co-Investigator(Kenkyū-buntansha) |
ODA Masato 和歌山大学, システム工学部, 助教 (70452539)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 光物性 / 化合物半導体 / 混晶 / 量子井戸 / 発光素子 / 半導体レーザー / 欠陥反応 / 再結合 / 信頼性 |
|---|
| Research Abstract |
We have theoretically studied the electronic states in A1-xA* xB type compound mix crystal with diagonal disorder using an extension of CPA. We found that 1) if the potential energyεB is larger or less than bothεA andεA*, the electronic energy spectrum of the mix crystal shows monotonous change in the composition dependence. On the other hand, 2) ifεB is located betweenεA andεA*, the electronic energy spectrum shows a large band gap bowing and the band gap sometimes becomes zero. We also studied possibility of feedback and inflation mechanism among carrier captures by a deep-level defect and transient induced lattice vibrations using proper configuration coordinate diagrams for many carriers. Treating the lattice motion classically we selfconsistently simulated the time evolution of the interaction mode and a series of athermal captures of electron(s) and hole(s). When both the activation energies E acte and E acth are small, a series of successive athermal captures is enhanced and probable for high carrier densities, however, we found that thepossibility of inflation in the amplitude of the lattice vibration critically depends on the minority capture rate and the relative width of the phonon frequency distribution.
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