1995 Fiscal Year Final Research Report Summary
Microscopic analysis on surface reaction induced by laser irradiation and its application to atomic layr epitaxy
| Project/Area Number |
06452111
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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 science/Crystal engineering
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MATSUNAMI Hiroyuki Kyoto University, Graduate School of Engineering, Professor, 工学研究科, 教授 (50026035)
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| Co-Investigator(Kenkyū-buntansha) |
KIMOTO Tsunenobu Kyoto University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (80225078)
YOSHIMOTO Masahiro Kyoto University, Graduate School of Engineering, Lecturer, 工学研究科, 講師 (20210776)
FUYUKI Takashi Kyoto University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (10165459)
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| Project Period (FY) |
1994 – 1995
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| Keywords | MOMBE / Photo-chemical reaction / Surface reaction / Photo-induced ALE / In-situ observation / RHEED / GaP / Saturated adsorption |
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| Research Abstract |
Control of GaP growth at the atomic-layr level has been achieved by laser-triggering in metalorganic molecular beam epitaxy (MOMBE) under a simultaneous supply of triethylgallium and thermally cracked PH_3. The growth rate of GaP was enhanced at low substrate temperatures by ultraviolet light emitted from a N_2 laser. The growth rate is controlled by either the TEGa supply between laser pulses or the photon number, and it shows saturation with a high TEGa supply. This suggests that the adsorption of TEGa on a surface saturates.
Surface reactions triggered by pulsed laser irradiation for GaP growth were studied with reflection high-energy electron diffraction (RHEED) at a low temperature of 350ﾟC IN MOMBE.On the laser irradiation, the intensity of RHEED showed an abrupt decrease followed by gradual recovery. The abrupt decrease indicates that adsorbed TEGa on a GaP surface is photo-decomposed by the laser irradiation. The intensity recovery had much dependence on PH_3 flow rate, which indicates that the intensity recovery is related with surface reaction between photo-decomposed TEGa and P atoms. This result shows that the decomposition of TEGa by laser irradiation and the formation of GaP occur alternately under continuous supply of source geses. This opens up a new mode of ALE triggered by laser irradiation without alternate supply of source gases.
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