SPM-based Characterization And Fabrication Of Organic Functional Films

With the development of nanotechnology,the electronic devices will become "smaller,faster and cooler".However,the traditional micro-electronics technology based on inorganic semiconductor is getting closer to its physics limit,so that it is desiderative to seek new materials and technologies for replace,it is a suitable way to use organic functional materials to fabricate nano/molecular electronic device as next-generation devices.Thus,lots of countries have focused their resources on the research of organic functional materials.The study of materials science may include:the preparation,the characterization,the testing and the application of materials.In this paper,three kinds of organic materials,which are representative employing the prospect extensively,are chosen for systematical study in the field of organic functional films.Firstly,the preparation of high-quality polystyrene(PS) colloidal-crystals with large area and their application in the fabrication of nano-structure and the nano-metrology of SPM are studied.Secondly,nano-fabrication technology based on metal-organic bistable films (M-TCNQ films) composed of uniform nanograins is studied.Finally,the polarization fatigue phenomenon of ferroelectric polymer(P(VDF-TrFE) films) is studied.The main achievements of this paper include:●Compared three simple self-assemble methods for preparing PS colloidal crystals.●Thoroughly studied the micro mechanism of vertical deposition-method and the influence of different parameters(including kinds of the substrate,temperature,concentration,pH value and additives) on the formation of colloidal crystals.Quantitative analysis of colloidal crystals is discussed.All of these discussions can be considered as guidance for preparing highly ordered colloidal crystals with less defects.●Fabricated an array of Ag dots and an array of Ag rings by using PS colloidal crystals as the mask.●Innovatively applied colloidal crystals on the nano-metrology of SPM:grating-like colloidal crystals are prepared as 3-D calibration sample for SPMs instruments and the mechanism of forming grating-like colloidal crystals is explained.●A simple,effective and non-destructive method to obtain shape parameters of AFM tip by colloidal micro-spheres is proposed based on the geometry relationship between colloidal micro-spheres and AFM tip.●Fabricated a conductive nano-wire with length of 450nm and a 2×3 array of nano-dots of M-TCNQ by STM.Some parameters are discussed so that to provide a reference both on technology and theory for nanofabrication technology by STM.●Pioneered the study on polarization fatigue of ferroelectfic polymer films(P(VDF-TrFE) films).The influence of crystallinity on polarization fatigue is studied and the micro-observation of polarization fatigue by SPM is conducted.Feasible measures for recovering the ferroelectric property are discussed.A physical hypothesis of charge injection is introduced to explain the experimental results.