Abstract
In this thesis, we reveal that we can use two different adsorption ways (annealed and as-grown) to manipulate the interfacial dipole. In our experiment, we use polar organic molecular ClAlPc with a Cl atom protruding out of the center. This high- electron-affinity atom attracts electrons from the silver thin film below and cause a strong interfacial dipole. With theoretical simulation, we can proof 1 ML ClAlPc thin film annealed after adsorptions are mostly in Cl-up configuration; electrons from the silver thin film are less likely attracted by Cl atom so the charge transfer from the silver thin film mainly occurs at orbitals of benzene rings far from the Cl atom, but in the case of 1 ML ClAlPc thin film grown via as-grown method, if the deposition rate is slow, then ClAlPc molecules are mostly in Cl-down configuration; electrons from the silver thin film are attracted by Cl atom so charge transfer from the silver thin film mainly occurs at the molecular orbitals of ligand structure closer to the Cl atom.