Study On The Structures And Electronic States Of FePC On Ag(110)

Organic electroluminescence is a highly advanced technology in the field of flat-panel display, which have been paid more and more attention by its potential applications.Organic Light-emitting Devices have been considered as the dominant candidates for future electronic devices which will replace the liquid-crystal display technology before long, because of a series of attractive advantages such as high luminescence efficiency, full colourful display, broading visual angle, short reactive time, lower operation voltage, lower working temperature and etc.But there are several problems of OLEDs, such as luminescence efficiency, life-span, the stability and etc. In order to solve those problems, much more efforts on the researches of the OLEDs have been used as the effective ways to improve the organic semiconductor industry. However, the knowledge about interface properties is almost based on the experience, and the basic theory of organic semiconductor luminescence has not been paid enough attention yet. Because the OLEDs is based on the structure of thin film, the manufacture, properties and structure of thin film can obviously influence the applications of OLEDs. Therefore, the systemic studies of the basic theory related on OLEDs are necessary, which included ordering growth of the thin film, charge transport, properties of luminescence and etc, and is necessary for improving performance and luminescence efficiency of the OLEDs.X-ray photoelectron spectroscopy (XPS) which also known as Electron Spectroscopy for Chemical Analysis (ESCA), has highly sensitivity on surface analysis, which is suitable for the quality and quantity analysis of surface physics. It is also applied in the research of chemical valence.therefore, it can be widely used on material, electric material, chemistry, mechanism and etc. So we use Photoemission measurements for Iron Phthalocyanine (FePC) overlayer on Ag(110) in our research. The XPS measurements show a weak interaction between FePC and Ag substrate. With the XPS datas, a Stranski-Krastanov growth model can be calculated. We design two kinds of growing models, and then compare with the chemical shift data to identify which one can fulfill the experimental data. (XPS) measurements also show a decrease in work function with increasing thickness of FePC overlayer. The odd chemical shift mainly coursed by the dipoles which formed due to the polarization phenomenon between first layer of FePC and Ag substrate.