1990 Fiscal Year Final Research Report Summary
Study of Visible Photoluminescence Mechanism in Ultra-Fine Si Particles
| Project/Area Number |
01460142
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
FURUKAWA Shoji Kyushu Institute of Technology, Department of Computer Science and Electronics, Associate Professor, 情報工学部, 助教授 (30199426)
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| Co-Investigator(Kenkyū-buntansha) |
MIYASATO Tatsuro Kyushu Institute of Technology, Department of Computer Science and Electronics,, 情報工学部, 教授 (90029900)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Silicon / Ultra-Fine Particle / Room Temperature Visible Photoluminescence / Luminescence Mechanism / Three-Dimensional Quantum Effect / Sputtering / Cluster / Band Gap |
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| Research Abstract |
The binary Si : H materials prepared by means of a reactive sputtering in pure hydrogen atmosphere at about 100 K have a large optical gap of up to 2.4 eV, and show a visible photoluminescence at room temperature. In this project, the structure of the materials and the mechanism of the visible photoluminescence have been investigated. The summary of the research results are as follows : (1) The peak wavelength and the strength of the photoluminescence spectrum become decreased and increased, respectively, with a decrease in the measurement temperature. (2) From the structural analysis, it is concluded that the material consists of very small Si microcrystals surrounded by hydrogen atoms. (3) The Si : H material prepared at room temperature consists of relatively large Si microcrystals. This indicates that a crystalline material can be obtained by the present preparation method, irrespective of the low substrate temperature, and suggests that the material prepared at about 100 K consists of very small Si microcrystals. (4) From above results, it is concluded that a three-dimensional quantum size effect is the most probable origin for the visible photoluminescene at room temperature, because the increase in the optical gap and the efficient luminescene can be explained by the quantization of states and the effect of confinement, respectively.
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Research Products
(20 results)
