State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Adv Mater. 2023 May;35(20):e2300240. doi: 10.1002/adma.202300240. Epub 2023 Mar 27.
The development of high-performance organic thin-film transistor (OTFT) materials is vital for flexible electronics. Numerous OTFTs are so far reported but obtaining high-performance and reliable OTFTs simultaneously for flexible electronics is still challenging. Herein, it is reported that self-doping in conjugated polymer enables high unipolar n-type charge mobility in flexible OTFTs, as well as good operational/ambient stability and bending resistance. New naphthalene diimide (NDI)-conjugated polymers PNDI2T-NM17 and PNDI2T-NM50 with different contents of self-doping groups on their side chains are designed and synthesized. The effects of self-doping on the electronic properties of resulting flexible OTFTs are investigated. The results reveal that the flexible OTFTs based on self-doped PNDI2T-NM17 exhibit unipolar n-type charge-carrier properties and good operational/ambient stability thanks to the appropriate doping level and intermolecular interactions. The charge mobility and on/off ratio are fourfold and four orders of magnitude higher than those of undoped model polymer, respectively. Overall, the proposed self-doping strategy is useful for rationally designing OTFT materials with high semiconducting performance and reliability.
高性能有机薄膜晶体管（OTFT）材料的发展对于柔性电子至关重要。目前已经报道了许多 OTFT，但同时获得高性能和可靠的柔性电子 OTFT 仍然具有挑战性。本文报道了在共轭聚合物中实现自掺杂，从而在柔性 OTFT 中获得高的单极 n 型电荷迁移率，以及良好的工作/环境稳定性和耐弯曲性。设计并合成了具有不同侧链自掺杂基团含量的新型萘二酰亚胺（NDI）共轭聚合物 PNDI2T-NM17 和 PNDI2T-NM50。研究了自掺杂对所得柔性 OTFT 电子性能的影响。结果表明，基于自掺杂 PNDI2T-NM17 的柔性 OTFT 表现出单极 n 型电荷载流子特性，并且由于适当的掺杂水平和分子间相互作用，具有良好的工作/环境稳定性。电荷迁移率和开关比分别比未掺杂模型聚合物高四倍和四个数量级。总体而言，所提出的自掺杂策略对于合理设计具有高半导体性能和可靠性的 OTFT 材料非常有用。
