Molecular Junctions: Introduction and Physical Foundations, Nanoelectrical Conductivity and Electronic Structure and Charge Transfer in Organic Molecular Junctions

摘要

There are fewer components in the nanoelectronics industry that do not use some kind of molecular junctions or interface. In general, many nanoelectronic devices have layered structures, and the behavior of the electron at the interface affects the electron properties of the final component, because the electron transfer mechanisms at the interface and multiple junctions are significantly different from the bulk material. Their junctions were studied. It was shown that to study the mechanisms of electron transfer and parameters affecting the conductivity of the junctions, various molecular junctions such as broken junctions can be used. It has been suggested that the solution temperature, shape, material, and spatial arrangement of the molecule used, the material, properties and surface nature of the metal electrodes, and the band structure of the junction's components can affect the conductivity of these systems. Attempts have been made to introduce the salient features of each of these junctions and to discuss examples of real Nano electronic components and molecular junctions used in them. We will see that the conventional mechanisms for electron transfer in these devices strongly depend on the electronic structure of the molecules used and generally include direct tunneling, fullerene tunneling. Molecularly deals with the effects of various factors on it. controlling the conductivity of a molecular bond by changing its physical, chemical and mechanical properties and optimizing the electrical properties of the final nanoelectronic component. Organic molecular junctions, as a special form of molecular junction, are used in many organic nanoelectronic devices. Therefore, it is very important to study the nature of the interface between these junctions and their electron transfer mechanisms. Conductivity of junctions is analyzed based on the band structure of their components. Therefore, in this paper, organic molecular compounds are introduced and their electronic structure is discussed. As you will see, certain phenomena also occur in these junctions, the most important of which are the formation of organic dipoles at the interface of the organic molecule/metal and the CNL parameter. Attempts have been made to put these phenomena into plain language without addressing mathematical models and the heavy concepts of quantum physics, and to discuss their effect on charge transfer and the electronic structure of organic junctions.