Dynamics Study Of Complex Conducting Polymers Structure And Conducting Property

Since 1970s, research on organic materials has made rapid progress, especially for conducting polymers. Several factors have greatly affected this rapid progress. On the one hand, conducting polymers not only show metallic properties but also posses low cost characteristic as resources. On the other hand, some new mechanism for transport arises from the research of conducting polymers. For these reasons, conducting polymers have attracted enormous interest. Up to now, many optoelectronic devices are designed fundamentally based on conducting polymers, for example, light emitting diodes, field effect transistors, and so on.Since polymer structures are easily varied, due to interchain and intrachain interactions, complex polymer chains may have different lattice configurations provided with different initial states. Starting initially with an equidistance lattice configuration, a double chain system can evolve to form domain walls within the chain. The dynamical property is different with different lattice configurations. After an electron or a hole is injected into a polymer chain, a polaron will form. As a constant electric field is applied along the chain direction, the polaron can move along the chain. We have found that the domain wall affects the motion of the polaron. In this paper, we investigated the domain wall formation and its effect on the motion of polaron by using an adiabatic dynamics method.In the first chapter, we discuss the basic structure of polymer as well as Peierls phase transition theory.In the second chapter, we introduce a classical model----SSH model. At the same time, we introduce an adiabatic dynamic method.In the third chapter, we focus on dynamic processes of lattice configuration with different initial lattice configurations within adiabatic method, and study domain wall effect on the transport of polaron under the electric field.(1)In the case of small fields (E<=20000V/cm), the polaron cannot penetrate the first domain wall due to the interaction with domain wall, (2)in the second regime, the fields are greater than 30000V/cm and less than 70000V/cm. Due to the driving fields increasing, the polaron has sufficient kinetic energy to go through the domain wall. (3) by increasing the field strength, it is found the electron of polaron is almost in a free state and it can tunnel through the domain wall quickly. In the fourth chapter, summaries are given.