Electronic properties of single and arranged organic molecules on semiconductor surfaces

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We investigated adsorbed states and electronic structures of organic molecules on the Si(100) surface experimentally and theoretically. Obtained results are summarized as follows.(1)We found out the regioselective cycloaddition reaction between asymmetric alkene molecules and the asymmetric dimer on Si(100)c(4x2) using low temperature STM. The first principles calculations have elucidated the reaction mechanism.(2)Photo induced reaction and desorption were investigated for the π-complex type weakly adsorbed ethylene on Si(100)c(4x2).(3)Adsorbed states of 1,4-cyclohexadiene were investigated as a function of adsorption temperature. Three different adsorbed states were found out using STM. The STS measurements of room-temperature adsorbed species (probably a table type species) were performed.(4)The electronic states of interface at SiO_2/Si(111) were directly probed by means of soft-X ray emission spectroscopy using SPring8. The site-specific electronic states are elucidated for the first time.(5)In the framework of the first principles calculation, the electronic states of organic molecules on Si(100) under electric bias were investigated. Energy shifts of molecular orbitals depend on the height and the strength of electric field.(6)We have constructed an apparatus including a fine electron gun which can be used for electron induced surface reaction in order to fabricate sub μm artificial structures. We demonstrated the electron-induced iron deposition from Fe(CO_)5 multilayer on Si(100).