| Project/Area Number |
09555001
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
SEKIGUCHI Takashi Tohoku Univ.Inst.for Materials Research, Research Associate, 金属材料研究所, 助手 (00179334)
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| Co-Investigator(Kenkyū-buntansha) |
KITAZAWA Koichi Hitachi Co.Ltd., 計測事業部, 主任研究員
TOMIZAWA Jyun'ichiro Hitachi Science Systems Co.Ltd., 第一設計部, 研究員
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥13,200,000 (Direct Cost: ¥13,200,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥11,100,000 (Direct Cost: ¥11,100,000)
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| Keywords | Cathodoluminescence / Semiconductor / nanostructure / Quantum dots / Quantum wire / InGaAs / GaAs / ZnO / bonded Si |
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| Research Abstract |
We were intended to develop the characterizing technique of electronic structure of nano-scale materials and have fabricated a cathodoluminescence (CL) system which has a spatial resolution of 50 nm. Such a high resolution was realized using low electron beam voltages as 1 kV.A new thermal-field-emission gun was developed to achieve an electron beam current of 5 nA at 1 kV operation. A light collection system with high efficiency was developed using ellipsoidal mirror and fiber optics to detect faint light from nano-materials. Serial (photon counter) and parallel (CCD) light detection systems were also equipped to realize CL image and spectra. CL images were recorded on the memory of computer, which makes it possible to the analyze CL intensity quantitatively. With this system, we have studied quantum structure such as quantum dots and wires.
CL from InGaAs/GaAs quantum dot structures formed on the tetrahedral-shaped recesses on GaAs (111)B substrates were extensively studied with analyzing the dependencies of excitation power and observing temperature. The self-organized quantum structure in II-VI semiconductors using Stranski-Krastanov growth were also evaluated with CL.
The optical properties of ZnO nano-particles of various shapes, such as hexagonal plates, prisms and tetrapods, were also studied in detail.
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