| Project/Area Number |
18340089
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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 | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Kyoto University |
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Principal Investigator |
KANEMITSU Yoshihiko Kyoto University, Institute for Chemical Research, Professor (30185954)
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| Co-Investigator(Kenkyū-buntansha) |
TAYAGAKI Takeshi Kyoto University, Institute for Chemical Research, Assistant Professor (80422327)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,140,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2007: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2006: ¥9,900,000 (Direct Cost: ¥9,900,000)
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| Keywords | nanostructure / optical property / semiconductor / nanooarticle / imaging spectroscopy / time-resolved spectroscopy / nanowire / ナノ材料 / 半導体材料 |
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| Research Abstract |
We studied fundamental optical properties and high-density excited states in semiconductor nanostructures by means of space- and time-resolved laser spectroscopy. We explored novel optical functionalities in unique semiconductor nanostructures such as nanoparticle quantum dots, impurity-doped nanoparticles, and carbon nanotubes. These semiconductor nanostructure samples are inhomogeneous systems in the sense that they have broad distributions of size and shape and variations of surface structure and surrounding environment. Space- and time-resolved optical spectroscopy makes it possible to understand intrinsic optical properties and inherent optical functionalities of nanostructures. First, we developed the fabrication methods of nanoparticle and nanotube samples and the techniques of space- and time-resolved laser spectroscopy. Using these sample preparation and optical spectroscopic techniques, we studied high-density excited states in semiconductor nanostructures. We improved our laser spectroscopy systems for optical measurements at wide spectral region and temperatures and also developed a new spectroscopic system by the integration of an optical microscope with a femtosecond laser. We further investigated the photoluminescence spectra and dynamics under the high-density excitation in semiconductor nanostructures including semiconductor nanoparticles, impurity-doped' nanoparticles, silicon nanowires, carbon nanotubes, and bulk mixed crystal samples. We discussed the exciton many-body effects and high-density excitation effects in low-dimensional semiconductor nanostructures.
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