具有强D-A相互作用的低成本高性能聚噻吩衍生物给体材料的设计与研究

有机太阳电池的产业化应用需要解决效率-成本-稳定性三方面的问题，随着非富勒烯受体的发展，有机太阳电池的效率已经快速突破了13%。不过，目前的高效率主要基于高成本给受体材料，不利于往后的产业化应用。本项目拟使用容易获取的噻吩或苯环衍生物作为给电子单元，使用含氟原子、酯基或吡嗪等吸电子基团的噻吩、并噻吩或苯环衍生物作为吸电子单元，借助非共价键相互作用来简化合成，并保证分子骨架平面性和分子内有效的D-A相互作用，设计合成一系列低成本的聚合物给体材料，研究聚合物给体材料分子结构与材料性质之间的关联，并与非富勒烯受体材料进行筛选匹配，通过纳米级相分离互穿网络结构形貌的优化，实现效率超过10%的低成本有机太阳电池，从而推动有机太阳电池的产业化发展。

The industrial applications of organic solar cells (OSCs) need to solve the problems of efficiency-cost-stability. With the development of non-fullerene acceptors, OSCs have achieved great progresses with the efficiencies exceeding 13%. However, such high efficiencies are obtained with high-cost materials, which is not beneficial for the future applications. Therefore, this project plans to use widely available thiophene or benzene derivatives as the electron-donating units, and use thiophene, bithiophene or benzene derivatives containing fluorine, ester or pyrazine groups as the electron-withdrawing units, to construct a series of low-cost high-performance polymer donor materials. Besides, noncovalent interactions will be utilized to simplify the synthetic routes and ensure molecular backbone planarity and strong D-A intramolecular interactions. Then, relationships between molecular structures of polymers and materials properties will be carefully studied. After pairing with non-fullerene acceptors and optimizing the blend morphology to achieve nanoscaled phase separation and bicontinuous interpenetrating networks, low-cost high-performance OSCs will be fabricated with the target efficiencies over 10%, thus promoting the practical applications of OSCs.