基态非简并聚合物中的极化子和双极化子动力学

Dynamics of polarons and bipolarons in nondegenerate polymers

研究了极化子和双极化子在基态非简并聚合物中的动力学 .弱电场下 ,发现载流子为带电极化子或双极化子 ,它们的晶格态与电荷态始终耦合在一起同步运动 .极化子比双极化子的运动速度快 ,存在饱和速度 ,且它们的饱和速度随聚合物非简并度的增加而降低 ;强电场下 ,元激发的电荷态将脱离晶格态的束缚而快速运动 ,参与导电的不再是极化子或双极化子 。

We investigate theoretically the dynamic process of polarons and bipolarons in nondegenerate polymers. In a low field, it is bigger that the carriers are charged polarons or bipolarons, their lattice configurations and charge densities move together all along. The velocity of polarons is bigger than that of bipolarons in the same system. Both polarons and bipolarons have their saturated velocities. The saturated velocities decrease with the increase of the nondegenerate parameters. In a high electric field, the electronic states of polarons and bipolarons; are dissociated from their lattice states, and move with high velocities. In this case, the carriers are electrons rather than polarons or bipolarons.