| Research Abstract |
The main results obtained in this project are summarized as follows : (1) The initial stages of the adsorption of Al2Cl6 molecules are elucidated, in which rest atoms play an important role in the adsorption process. An A12C16 molecule decomposes on adsorbtion, resulting in the preferential adsorption of Cl and AlClx molecules onto the center adatom. Based on these findings, the desorptin of adsorbed single Cl atom and AlClx molecule is demonstrated. We succeeded also in the displacemnet of the molecule and the decomposition of the molucule, resulting in the adsorption of an Al atom. (2) Local atomic structures of HF-treated Si (111) surfaces are elucidated using STM.Based on this study, Ga nano dots are deposited onto (C2H5) 3Ga-adsorbed HF-treated Si (111) surfaces by appling a voltage pulse between the tip and the sample surface. The underlying mechansism is the electric-field enhanced decompositin of the adsorbed (C2H5) 3Ga molecule below the tip. (3) Local atomic structures of Al-adsorbed Si (111) surfaces and atomistic processes during Si solid phase epitaxy are elucidated.
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