Formation of Charged Soliton in a Metal/polymer Structure

摘要

Based on a nonadiabatic dynamic method, charge injection is studied in a metalpolymer structure. For a system with a short polymer chain, with a proper voltage bias applied to the metal electrode, one electron is injected into the polymer chain and then a charged soliton forms. For a system with a relatively long chain, it is hard to inject an electron to polymer to create a charged soliton. Electrons can be injected into the polymer by further increasing the voltage bias. The injected electrons form a polaron-like wave packet rather than a charged soliton. The reason lies in the requirement for charge injection that there must be some overlap between wave functions of soliton state and interfacial electrons.