1989 Fiscal Year Final Research Report Summary
Investigation of the Mechanism of Ge/Si heteroepitaxial Growth with Interfacial Reactions
| Project/Area Number |
63460055
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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 |
Applied materials
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| Research Institution | Nagoya University |
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Principal Investigator |
YASUDA Yukio Nagoya Univ., School of Eng., Professor, 工学部, 教授 (60126951)
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| Co-Investigator(Kenkyū-buntansha) |
KOIDE Yasuo Nagoya Univ., School of Eng., Research Associate, 工学部, 助手 (70195650)
ZAIMA Sigeaki Nagoya Univ., School of Eng., Associate Professor, 工学部, 助教授 (70158947)
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| Project Period (FY) |
1988 – 1989
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| Keywords | In-situ observation / Hreteroepitaxy / Gas source molecular beam epitaxy / Germanium / {811} facet / RHEED / Initial Stage / Silicon |
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| Research Abstract |
Recently, the application of Ge/Si superlattices to optical devices has received considerable attention, because the Ge/Si multilayer structure has a direct band-gap. In order to fabricate these Ge/Si heterostructures, it is essential to have a thorough understanding of the mechanism of the heteroepitaxial growth and solid phase reactions at growing interfaces. In the present work, the growth process in the initial stage of growth of Ge on (100)Si and (811)Si substrate surfaces by gas source molecular bean epitaxy using GeH4 has been studied by in-situ reflection high energy electron diffraction (RHEED) observation. Focus in this work has been placed on the mechanism of the heteroepitaxial growth with the interfacial reactions at the growing interfaces. The following growth process and dynamic behavior of the film growth have been made clear.
A strained film by the monolayer overgrowth mode is formed initially with an epitaxial relationship of the parallel orientation, and Ge islands wi
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th facets are grown with proceeding the growth over examined substrate temperatures of 300-700ﾟC. In the island growth stage on (100)Si surfaces, the predominant facet of the growing islands is (811)Ge planes initially and this changes to 1311)Ge eventually with growth. In the case of the island growth on (811)Si surfaces, plate-shaped Ge islands with (811) facets are grown, but the predomi nant facet changes to 1311)Ge and (100)GE planes with the further growth. These growth processes accord with those of Ge films on (100)Si surfaces. It is concluded that Ge islands with (8111 facets are energetically stable in the initial stage of the island growth on the (811)Si surfaces as well as the (100)Si surfaces.
It has been found that an ordered structure of Ge and Si atoms are formed in the initial steps of growth, which results from the solid phase reaction near the growing interfaces. In future, we intend to investigate the thermal stability of the {811} surface and make clear the mechanism of heteroepitaxial growth and the origin of the ordered structure in the system of the Ge/Si heterostructure with the interfacial reaction. Less
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Research Products
(6 results)
