增强D-A共轭聚合物晶界内部tie molecule共平面构象是提高薄膜载流子迁移率的重要手段。理解影响D-A共轭聚合物体系tie molecule构象的物理参数，掌握调控tie molecule构象的方法及手段，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)研究具有不同主链刚性及侧链位阻的D-A共轭聚合物分子的tie molecule共平面程度，总结影响tie molecule构象的相关参数。(2)研究分子链缠结程度对tie molecule构象的影响，通过调节溶液状态降低分子链缠结程度实现tie molecule共平面构象的调节并阐述相关机制。(3)将溶液状态与成膜方法相结合，利用晶区长程有序排列诱导tie molecule采取共平面构象，实现tie molecule构象及晶体排列的同时优化。(4)构建溶液状态-薄膜形貌-载流子迁移率间的关系。

Enhancing the coplanar conformation of tie molecule in grain boundary of donor-acceptor conjugated copolymer is an important strategy to elevate the carrier mobility. Better understanding the parameter of affecting the conformation of tie molecule in grain boundary of donor-acceptor conjugated copolymer, developing the effective physical methods to tune the tie molecular conformation and correlating the condensed state structures and the 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: (1) The effect of stiffness in the backbones and steric hinder in the side chains of donor-acceptor conjugated copolymer on the tie molecular coplanar conformation will be investigated(2) The effect of the entanglement degree of molecular chains on the tie molecular conformation will be realized by adjusting the solution state. (3) Aligning the crystals will be used to induce the tie molecular coplanar conformation. The optimization of tie molecular conformation and alignment of crystalls will be simultaneously tuned by the solution state and film forming process. (4) The relationship between morphology and carrier mobility will be established, which will provide the theoretical guidelines for optimizing the morphology and performance of conjugated polymer films.