Spectroscopic Studies of Surface Layers of Semiconductor Microcrystals
半导体微晶表面层的光谱研究
基本信息
- 批准号:01460078
- 负责人:
- 金额:$ 3.84万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1989
- 资助国家:日本
- 起止时间:1989 至 1991
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In general, optical studies of solid surfaces are extremely difficult, because the number of atoms interacting with incident light is extremely small and the optical signals containing the information about the surfaces are extremely weak. However, for the study of surface layers of microcrystals, which are essentially the systems having large surface-tovolume ratios, the optical spectroscopies are expected to be effective. In this research project, we used mainly the infrared and Raman spectroscopy in an attempt to prove the effectiveness of the optical studies of the micocrystalline surfaces.It turned out that infrared absorption by surface oxide layers of gas-evaporated Si and Ge microcrystals can easily be observed. Furthermore, processes of the formation of the natural and thermal oxides could be investigated in detail. Under the conditions of surface plasmon excitation, the surface-enhanced Raman scattering from the surface layers of Ag small particles could be clearly observed. The Raman signals from surface layers of extremely small Ge microcrystals (less than 50A in diameter) could also be observed. All these experimental results demonstrate the effectiveness of the optical spectroscopy for the studies of the microcrystalline surfaces.we also studied the phase transition behavior of gas-evaporated W03 microcrystals using the Raman spectroscopy. We found a new phase which is not reported so far for the bulk crystals. The appearance of the new phase seems to be caused by the existence of the surfaces. For various kinds of microcrystals, we have demonstrated the quantumsize effects from the measurements of resonance-Raman scattering, optical absorption and photoluminescence. In some cases, we suggested the importance of the surface effects, which are superposed on the quantum size effects.
一般来说,固体表面的光学研究是非常困难的,因为与入射光相互作用的原子数量非常少,包含表面信息的光学信号非常微弱。然而,对于微晶的表面层的研究,这本质上是具有大的表面积与体积比的系统,光学光谱被期望是有效的。在本研究计画中,我们主要使用红外光谱和拉曼光谱来验证微晶表面光学研究的有效性,结果发现,气相蒸镀的硅和锗微晶表面氧化层可以容易地观察到红外吸收。此外,可以详细研究天然氧化物和热氧化物的形成过程。在表面等离子体激元激发条件下,可以清楚地观察到银小颗粒表面层的表面增强拉曼散射。在直径小于50埃的极小Ge微晶表面层也能观察到拉曼信号。这些实验结果证明了光学光谱学在研究微晶表面方面的有效性。我们还利用拉曼光谱研究了气相蒸镀的W_(03)微晶的相变行为。我们发现了一个新的相,这是迄今为止没有报道的大块晶体。新相的出现似乎是由表面的存在引起的。对于不同种类的微晶,我们通过共振拉曼散射、光吸收和光致发光的测量证明了量子尺寸效应。在某些情况下,我们提出了叠加在量子尺寸效应上的表面效应的重要性。
项目成果
期刊论文数量(100)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Arai,S.Hayashi,K.Yamamoto and S.S.Kim: "Raman Studies of Phase Transitions in Gas-Evaporated WO_3 Microcrystals" Solid State Commun.75. 613-616 (1990)
M.Arai、S.Hayashi、K.Yamamoto 和 S.S.Kim:“气体蒸发 WO_3 微晶相变的拉曼研究”固态 Commun.75。
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- 发表时间:
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- 影响因子:0
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- 通讯作者:
Shinji Hayashi, Minoru Fujii and Keiichi Yamamoto: "Quantum Size Effects in Ge Microcrystals Embedded in SiO_2 Thin Films." Jpn. J. Appl. Phys.28. 1464-1466 (1989)
Shinji Hayashi、Minoru Fujii 和 Keiichi Yamamoto:“嵌入 SiO_2 薄膜中的 Ge 微晶的量子尺寸效应”。
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
Shinji Hayashi and Keiichi Yamamoto: "Raman Scattering from Microcrystals." Phase Transitions. 24-26. 641-660 (1990)
Shinji Hayashi 和 Keiichi Yamamoto:“微晶体的拉曼散射”。
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- 影响因子:0
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S.Hayashi,R.Koga,M.Ohtsuji and K.Yamamoto: "Surface Plasmon Resonances in Gas-Evaporated Ag Small Particles:Effects of Aggregation" Solid State Commun.76. 1067-1070 (1990)
S.Hayashi、R.Koga、M.Ohtsuji 和 K.Yamamoto:“气体蒸发的银小颗粒中的表面等离子共振:聚集的影响”Solid State Commun.76。
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- 影响因子:0
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- 通讯作者:
M.Fujii,S.Hayashi and K.Yamamoto: "Quantum Dots of Ge Embedded in SiO_2 Thin Films:Optical Properties" Proc.20th Int.Conf.on the Physics of Semiconductors. 3. 2375-2378 (1990)
M.Fujii、S.Hayashi 和 K.Yamamoto:“嵌入 SiO_2 薄膜中的 Ge 量子点:光学特性”Proc.20th Int.Conf.on 半导体物理。
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- 影响因子:0
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YAMAMOTO Keiichi其他文献
YAMAMOTO Keiichi的其他文献
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26560270 - 财政年份:2014
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26381108 - 财政年份:2014
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22570154 - 财政年份:2010
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08640819 - 财政年份:1996
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$ 3.84万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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