中文摘要：

应用包含了链内无序和外加电场的Su-Schriffer-Heeger（SSH）模型,本文研究了聚合物链上正负极化子对的复合过程中的无序效应。应用非绝热近似方法处理电子部分的含时薛定谔方程,而晶格部分的运动则由牛顿方程决定。研究表明：在纯净的聚合物链中,正负极化子对仅能够在较弱的外电场下复合成中性激子;而考虑了无序效应后,激子可以在一个更大的电场强度范围下生成,亦即无序效应有利于极化子对的复合。

英文摘要：

By using a nonadiabatic evolution method for the time-dependent Schrdinger equation and a Newtonian equation of motion for lattice,we investigate the disorder effects on the recombination process of oppositely charged polarons in a single polymer chain. The simulations are performed within the framework of an extended version of the Su-Schrieffer-Heeger model modified to include diagonal disorder and an external electric field. It is found that oppositely charged polarons can recombine into a neutral exciton in the presence of a weak electric field. But under the disordered system,the exciton can be produced under a wide range of applied electric field.