Abstract
We have studied the system of TTC and PFT on uniform silver thin films. The interfacial properties between the organic molecules and the uniform silver thin film can be probed by the use of the angle-resolved photoemission spectroscopy (ARPES). After the deposition of the organic molecules onto the silver surface, we found the change of energy position of the QWS and the change of the vacuum level, and these phenomena can be attributed to the result of the change of the interfacial potential at the organic/metal interface. From our results, we found that the vacuum level shift toward opposite directions and these results might come from the difference of the electron affinity of TTC and the PFT. By introducing the Bohr-Sommerfeld quantization rule and the modified image potential model, the dielectric constant of the organic thin film can be extracted.