稠合DAD单元构筑的聚合物受体材料在全聚合物光伏电池中的应用

聚合物受体因其易于调节的光电性质、优异的热、光、机械稳定性和易于大面积加工的高油墨粘度的特点，一直以来都备受研究者的关注。然而，聚合物受体对近红外区域的光利用率低、电子迁移率低以及与聚合物给体共混的薄膜形貌调控难的缺点，大大限制了全聚合物太阳能电池效率的进一步提升。设计全新结构的高效聚合物受体材料是十分必要的。本项目将设计合成一系列基于稠合DAD单元的聚合物受体。通过改变中心DAD稠合单元、侧链类型、共聚单元类型来细致研究这类n型聚合物的结构——性质——性能的关系，获得一类结晶性好、光捕获能力优异、电子迁移率高的聚合物受体。通过修饰给体和受体分子的分子结构和引入非共价键相互作用建立构象锁等方法来提高聚合物给体和聚合物受体的相容性和调节光活性层的形貌。结合器件优化和封装技术，最终实现全聚合物太阳能电池器件效率显著增长和重大突破。

Polymer electron acceptors have attracted much attention of researchers recently, because of their tunable optical and electrochemical properties, superior thermal, photo and mechanical stability, as well as high viscosity for large-scale manufacturing. However, the low light utilization in the near-infrared region, low electron mobility, and undesirable morphological features of the polymer blend significantly limited the further improvement of the efficiency for the all-polymer solar cells (all-PSCs). Thus, it is necessary to design novel and high-efficiency polymer electron acceptors. In this project, we will design and synthesize a serious of fused DAD structure-based polymer electron acceptors. By optimizing the center DAD fused groups, alkyl side chains and comonomer units of the polymers, we will systematically study the structure-property-performance relationship for the n-type polymers. And we will obtain a class of promising n-type polymers with good crystallinity, superior light-harvesting capability, and high electron mobility. Aiming to fine-tune the compatibility of the polymer donor and polymer acceptor and further control the blend morphology in all-PSCs, we will carefully design the structure of the polymer electron donors and acceptors and introduce the non-covalent interactions to construct conformational locks. Combining with the device optimization and thin-film encapsulation technology, finally, we will increase the device performance of all-PSCs devices obviously and achieve a significant breakthrough in this field.