2001 Fiscal Year Final Research Report Summary
Study on Enhancement of Non-Phonon Excitonic Luminescence by using Inhomogeneous strain fields
| Project/Area Number |
11450002
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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 |
Applied materials science/Crystal engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SHIRAKI Yasuhiro Graduate School of Engineering, The University of Tokyo, Professor, 大学院・工学系研究科, 教授 (00206286)
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| Co-Investigator(Kenkyū-buntansha) |
KOH Shinji Graduate School of Engineering, The University of Tokyo, Research associate, 大学院・工学系研究科, 助手 (50323663)
USAMI Noritaka Tohoku University, Institute for Materials Research, Assistant professor, 金属材料研究所, 助教授 (20262107)
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| Project Period (FY) |
1999 – 2001
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| Keywords | SiGe / strain field / exciton / Optelectronics / Quantum dot / island growth |
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| Research Abstract |
In this work, we have investigated on the growth characteristics and the optical properties of the Ge islands grown on Si substrates. For the Ge-island growth, the most significant issues are increasing of the density of Ge islands and ordering of the size of the Ge islands. On these issues, we have tried two approaches. First, we have utilized staked Ge islands layers with thin Si spacer layers, which leads to. correlation of the each Ge islands layer resulting in the ordering of the size of the Ge islands. Second, we have utilize a lower-temperature grown Ge islands layers, on which higher-temperature grown Ge island layers are stacked via thin Si spacer layers, resulting in drastic size reduction of the Ge islands even at high growth temperature. In 2001, we have investigated on SiGe/Si distributed Bragg mirrors (DBRs) to enhance luminescence of SiGe quantum structures and successfully fabricated DBRs with a record reflectivity (>90 %). We have also fabricated a microcavity by using SiGe/Si DBRs, by which luminescence from SiGe/Si quantum wells and Ge islands drastically modulated. The directionality of the luminescence is also improved by the effect of microcavity.
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