Adsorption, photo-fragmentation, and ion-desorption pathways of organic molecules at semiconductor surfaces using synchrotron radiation techniques

Sekiguchi, Tetsuhiro  ; Ikeura, Hiromi*; Baba, Yuji  

The chemistry of organic molecules on semiconductor surfaces has attracted much attention due to the perspective of the molecular wires, self-assembled monomolecular layers (SAM), and semiconductor-organic hybrid formation such as SiC. We have investigated the adsorption interaction, photo-dissociation, and ion-desorption of multifunctional organic molecules such as acetone [(CH3)2C=O] adsorbed on Si substrates. We used synchrotron radiation techniques including polarization-angular dependences of near-edge X-ray absorption fine structure (NEXAFS) and photon-stimulated ion-desorption (PSID). We conclude PSID and NEXAFS techniques are useful tools to investigate chemical states such as configuration, orientation, and charge-transfer interaction of adsorbed molecules at surfaces.