在三种双受体聚合物中,具有中等Mn的PNDI-BT在单极n型有机晶体管中表现出高的电子迁移率,高可达0.6cm2 V−1 s−1,这主要得益于其相对平面的主链以及低未占据分子轨道较大的重叠等。值得注意的是,通过C−H活化合成的PNDI-BT的晶体管性能与传统的C(Sp2)-C(Sp2)-Stille法合成的PNDI-BT性能相当。后研究了聚合物分子量对器件性能的影响以及基于三种聚合物的器件的空气稳定性。
综上,展示了一种简单而有效的利用双受体策略和DArP结合合成n型聚合物的方案。所得到的双受体聚合物能够显示出良好的~10到30kgmol-1的摩尔质量和相对较窄的~2的多分散性指数。此外,作者将三种n型聚合物在相同DArP条件下摩尔质量的较大差异,归因于氢化受体单元的α-C-H酸度不同,并通过计算氢原子上的电荷值来进一步研究这一点。作者还全面研究了氢化受体单体对光学和电化学性质、分子几何形状和电荷输运的影响。
Among the three kinds of dual-receptor polymers, PNDI-BT withmedium Mn has the highest electron mobility in unipolar n-typeorganic transistors, up to 0.6 cm2 V − 1 s − 1, which is mainly dueto its relatively flat main chain and the large overlap of thelowest unoccupied molecular orbitals. It is worth noting that thetransistor performance of PNDI-BT synthesized by C − H activationis e to that of PNDI-BT synthesized by traditional C (Sp2)- C (Sp2) - Tile method. Finally, the influence of polymermolecular weight on device performance and the air stability ofdevices based on three polymers are studied.
To sum up, a simple and effective scheme for synthesis of n-typepolymer by combining dual-receptor strategy with DArP wasdemonstrated. The dual-receptor polymer obtained can show a goodmolar mass of~10 to 30kg mol-1 and a relatively narrowpolydispersity index of~2. In addition, the author attributed thelarge difference in molar mass of three n-type polymers under thesame DArP condition to α- The acidity of C-H is different, and thecharge value on hydrogen atom is calculated to further study thispoint. The effects of hydrogenated receptor monomers on optical andelectrochemical properties, molecular geometry and charge transportwere also comprehensively studied.