MECHANISMS OF EPITAXY AND PROPERTIES OF COHERENT THIN FILMS

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1) REM study revealed successive Au adsorption induced structural phase transitions and adatom densities in the 1 x 1 pahse and facet formation on vicinal Si (111) surfaces.2) Extensoion of above work fo the studies of facetting on [110] zone found various facet planes and their roughening phase transitions and their coverage dependences.3) SPA-LEED and REM studies of Au adsorbed vicinal (001) surface were carried out as a cooperative research works and they revealed dynamics of facet formation4) We revealed that effective charge of adatom Si on Si (111) surface can be reversed from positive to negative by adosrption of Au5) ROO<21>x ROO<21> structures were commonly observed on Si (111) ROO<3>x ROO<3>Ag by deposition of small amounts of Ag, Au and Cu.6) Standing waves on semiconductor surfaces were firstly observed by STM in case of Si (111) ROO<3>x ROO<3>Ag at 4K.7) It was found that an incommensulate adsorbate structure formed by Pb adsroption on Si (111) transforms to 200K to a 7x ROO<3> structure.8) Adatoms on quenched clean Si (111) surfaces have a reversible structural phase transition at around 230ﾟC between the c2x8 and disordered 1x1 strcutures.9) C60 molecules showed epitaxial relations on metal adsorbed Si surfaces depending on the superlattices induced by metals.10) Systematic studies were carried out by SPA-LEED for studies of formation of various types of defects in cases of various adsorption systems and epitaxy of CaF_2 were studied.11) From a conductivity measurements at 4k for systems of Ag/Si (111) a metal-insulator transition at 2 mnolayr level was observed.