物理化学学报 >> 2001, Vol. 17 >> Issue (04): 329-332.doi: 10.3866/PKU.WHXB20010410

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共轭聚合物薄膜中光生载流子的产生及输运机制

李宏建;彭景翠;许雪梅;夏辉   

  1. 湖南大学电子材料研究所,长沙　410082
  • 收稿日期:2000-07-24 修回日期:2000-12-07 发布日期:2001-04-15
  • 通讯作者: 李宏建

Mechanism of Photocarrier Generation and Transport in Conjugated Polymer

Li Hong-Jian;Peng Jing-Cui;Xu Xue-Mei;Xia Hui   

  1. The Institute of Electronic Materials, Hunan University, Changsha　410082
  • Received:2000-07-24 Revised:2000-12-07 Published:2001-04-15
  • Contact: Li Hong-Jian

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摘要： 对共轭聚合物光生载流子的产生机制进行了初步探讨，分析了由最初产生的电子空穴对经过晶格驰豫之后形成极化子激子的热离化过程，认为同一链上的激子会迅速复合，只有链间激子对光电流作出贡献.研究了共轭聚合物中载流子的输运机制，导出了共聚物的电导率公式，其计算值与实验结果符合，我们认为是极化子的链间跃迁实现了整个共聚物的电导和光致发光，较好地解释了实验事实.

关键词: 光生载流子, 热离化, 链间激子, 链间跃迁

Abstract: The mechanism of photocarrier generation and transport in conjugated polymer is studied. After analyzing thermalization of polaronexcitons which were formed through relaxation by dissociation electronhole pairs produced by photoexcitation initially. We infer that polarons along the polymer chains recombine rapidly and polarons between chains generate photocurrent. After investigating the transport mechanism of chargecarrier in conjugated polymer, a formula of conductivity of copolymers can be derived from chargecarriers generation and transport model (see Eq(6)), the calculated values agree with experimental data very well (see Table 2). We conclude that the conductance and photoluminescence in conjugated polymer could be attributed to polaron hopping between chains.

Key words: Photogenerated charge-carrier, Thermalizatoin, Polaron between chains