Dynamics study of electron extraction from 1D conjugated polymers to metal electrodes

作者：Zhou Yue Hua; Zhu Li Ping; Qiu Yu^*

来源：Organic Electronics, 2011, 12(2): 234-238.

DOI：10.1016/j.orgel.2010.11.022

• Polymer/metal joint
• Carrier mobility
• Polaron dynamics

We simulate the processes of electron extraction from 1D conjugated polymers to metal electrodes in the presence of electric fields based on the Su-Schrieffer-Heeger (SSH) model extended to a polymer/electrode contact structure. From the simulation, we can obtain the lifetime of the process that a charged carrier known as polaron at the polymer chain end starts to dissociate and the released electron tunnels to the electrode immediately. An effective carrier mobility named interface mobility can be defined for this process and calculated from the lifetime. It is found that the interface mobility is independent on the external electric fields. However, this mobility increases with decreasing the work function of the electrode. By enhancing the coupling between the polymer and the electrode, the interface mobility is shown to increase. Kinetic energy of the electrons is also shown to favor the improvement of the mobility.

• 出版日期2011-2
• 单位浙江师范大学