Three donor-acceptor (D-A) polymers P1–P3 are designed and synthesized, with 4,7-dibromo-5,6-difluorobenzo[c][1,2,5]thiadiazole (FBT) as A and thiophene derivatives as D. All polymers show good thermal stability. The UV–vis absorption spectra show that P1 has too strong aggregation in solution, and it has no obvious temperature-dependent aggregation (TDA) performance, which is also revealed in the variable temperature UV–vis absorption spectra. P2 film shows the same aggregation as in solution, P3 film shows stronger aggregation than that in solution. Polymers P1 and P2 both have strong TDA properties. Organic field effect transistors (OFETs) are prepared based on polymers P1, P2, and P3. OFETs devices prepared with high molecular weight polymers have better performance, and the polymer with 2-nonyltridecyl side chain leads to the highest hole mobility around 0.252 cm² V⁻¹ s⁻¹. The results show that the application of high molecular weight polymers and the selection of appropriate side chains are very important for the charge transport performance of OFETs.

中文翻译：

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氟化苯并噻二唑基聚合物的侧链工程：改善有机场效应晶体管的电荷传输

设计并合成了三种供体-受体（DA）聚合物P1-P3，其中A为4,7-二溴-5,6-二氟苯并[c][1,2,5]噻二唑（FBT），D为噻吩衍生物。所有聚合物均表现出良好的热稳定性。紫外可见吸收光谱表明P1在溶液中聚集性过强，并且没有明显的温度依赖性聚集（TDA）性能，这在变温紫外可见吸收光谱中也有所体现。P2膜表现出与溶液中相同的聚集性，P3膜表现出比溶液中更强的聚集性。聚合物P1和P2均具有很强的 TDA 性能。有机场效应晶体管（OFET）是基于聚合物制备的P1、P2和P3。采用高分子量聚合物制备的OFET器件具有更好的性能，并且具有2-壬基十三烷基侧链的聚合物导致最高空穴迁移率约0.252 cm ²  V ^-1  s ^-1。结果表明，高分子量聚合物的应用和合适侧链的选择对于OFET的电荷传输性能非常重要。