2002 Fiscal Year Final Research Report Summary
Simultaneous Observation of Surface Processes under Exited Gas Phase Atmosphere Using Ion and Light Probes
| Project/Area Number |
12305005
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
表面界面物性
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| Research Institution | Osaka University |
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Principal Investigator |
KATAYAMA Mitsuhiro Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (70185817)
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Shinichi Osaka University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (90324821)
OURA Kenjiro Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60029288)
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| Project Period (FY) |
2000 – 2002
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| Keywords | surface processes under exited gas phase atmosphere / low-energy ion scattering and recoiling spectroscopy / attenuated total reflection infrared spectroscopy / surface hydrogen / hydrogen-surfactant / strain engineering / growth morphology / surface nitridation process |
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| Research Abstract |
Thin film growth or etching in exited gas phase atmosphere is often performed as a surface process in various device fabrication procedures, where chemical vapor deposition (CVD) or gas source molecular beam epitaxy (GSMBE) is typically adopted. Although the interaction of gas phase particles (atoms, molecules, ions, plasma) with the surface of materials is a key process in such types of fabrication, its atomic-scale mechanism is not fully elucidated. This is in part due to the lack of appropriate surface analytical techniques feasible in exited gas phase atmosphere.
Ion scattering and recoiling spectroscopy (CAICISS/TOF-ERDA) with ions and attenuated total reflection infrared spectroscopy (ATR-FTIR) with light have proven to be useful in in situ monitoring of surface processes, in particular, for the determination of the amount of surface hydrogen atoms. In this project, we have developed a novel method for simultaneous observation of surface processes under exited gas phase atmosphere using ion and light probes.
The most significant result of its application is the elucidation of the growth process of Ge/Si(001) hydrogen-surfactant-mediated heteroepitaxy, in which exited atomic hydrogen is dynamically supplied to the growth front as a surfactant. It has been revealed that in the hydrogen-surfactant-mediated heteroepitaxy, (1) a submonolayer of H atoms readily acts as a surfactant, and (2) beyond an optimal H coverage, surface roughening occurs even though a monohydride phase is maintained at the growth front.
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