共轭聚合物π-π堆积间距及凝聚态结构调控和器件性能的研究

项目名称： 共轭聚合物π-π堆积间距及凝聚态结构调控和器件性能的研究

项目编号： No.21474113

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 刘剑刚

作者单位： 中国科学院长春应用化学研究所

项目金额： 88万元

中文摘要： 降低共轭聚合物π-π堆积间距是提高沿π-π叠加方向上载流子迁移率的重要手段。理解影响共轭聚合物体系π-π堆积间距的基本物理过程，掌握调控π-π堆积间距的有效物理手段，建立薄膜凝聚态结构和器件性能间的关系，对进一步优化薄膜凝聚态结构并提高器件性能具有指导意义。本项目主要内容包括：(1)研究不同分子结构在相似的溶液环境和加工条件下π-π堆积间距的变化规律，总结影响π-π堆积间距的相关参数。(2)研究溶剂环境和加工方法对聚合物分子结晶过程中主链及侧链物理状态和相互作用的影响，通过物理手段实现对共轭聚合物π-π堆积间距的控制并阐述相关机理。(3)将溶液状态与成膜手段相结合，在调节π-π堆积间距的同时分析其与薄膜热力学状态的相互影响，实现π-π堆积间距和结晶性、长程有序排列及分子取向的同时优化。(4)系统构建溶液状态-薄膜形貌-载流子迁移率间的关系，为进一步优化形貌、提高载流子迁移率提供理论依。

中文关键词： 共轭聚合物；溶液状态；凝聚态结构；π-π堆积

英文摘要： Decreasing the π-π stacking distances between conjugated polymer chains is a direct and important strategy to elevate the carrier mobility along the π-π stacking direction and even in the whole film device. Better understanding the clear process of variation of π-π stacking distances in conjugated polymer systems, developing the effective physical methods to tune π-π stacking distances and correlating the condensed structures in films and the final device performance are helpful to guide the optimization of morphology and electric properties for conjugated polymers. Therefore, our works will focus on the following aspects in this project: (1) Researching into the variation principle of π-π stacking distances with the conjugated chemical structures under the same solution environment and processing method, and summarizing the conjugated structural parameters to influence the π-π stacking distances. (2) Clarifying the effect of solvent and processing method on the physical state of backbones and side-chains plus their interactions during crystallization, realizing the effective tuning of π-π stacking distances by physical methods and proposing the corresponding mechanism. (3) Simultaneously optimizing the preferred π-π stacking distances and thermodynamic ordered state such as crystallinity, long range ordered alignment and molecular orientation, et al, by combining tuning solution state and processing parameters. (4) Constructing the mutual relation between physical driving forces, morphology and structures in films and carrier mobility to provide the theoretical guidelines for optimizing the morphology and performance of conjugated polymer films further.

英文关键词： Conjugated polymer;Solution state;Condensed structures;π-πstacking