Host: The Japan Society of Vacuum and Surface Science
Surface metal superstructures on semiconductors have different electronic states from those in the bulk, and superconducting transitions have been confirmed. Such a low-dimensional electronic state can be very sensitive to surfaces and interfaces, and it is possible to change their physical properties by depositing other materials on the surface and taking advantage of proximity effects such as charge transfer and exchange interactions. In this study, we deposited PTCDA and ZnPc molecules on the atomic layer superconductor Si(111)-(√7×√3)-In, and investigated the variation in the superconducting transition temperature (Tc) as a function of molecule coverage. Tc was obtained through electron transport measurements under ultrahigh vacuum. Tc were found to decrease for PTCDA and increased for ZnPc. Scanning Tunneling microscopy results show that the adsorption structure affects the change in Tc.
