Zhou Zhaoqiong, Li Yan, Chen Pinyu, Meng Jinqiu, Luo Nan, Luo Liang, He Feng, Shao Xiangfeng, Zhang Hao-Li, Liu Zitong
State Key Laboratory of Applied Organic Chemistry (SKLAOC), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
Guangdong Provincial Key Laboratory of Catalysis, Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Chemistry. 2023 Apr 3;29(19):e202203361. doi: 10.1002/chem.202203361. Epub 2023 Feb 28.
Conjugated polymers with high charge mobilities have drawn increasing attention in organic field-effect transistors (OFETs) in recent years. However, OFETs of conjugated polymers with high mobility and good device stability remain a challenge. In this article, we report a hyperbranched polymer approach to improve the charge mobility and device stability. Three hyperbranched diketopyrrolopyrrole-based polymers were designed and synthesized via linear alkyl side-chain linkers. The results show that 2D topological hyperbranched polymers form stable thin film microstructures, and thus improve the device stability, since the conjugated moiety is interconnected by linear alkyl chain. Besides, the incorporation of linear alkyl chain instead of branching alkyl one reduce steric hindrance, and improve the microstructure ordering as well as the charge mobility. Bar-coated OFETs result demonstrates that the devices mobilities and operational stabilities (bias stability and bending resistance) are both improved. All these indicate that hyperbranched polymer is a potential candidate for future application.
近年来，具有高电荷迁移率的共轭聚合物在有机场效应晶体管（OFET）中受到越来越多的关注。然而，制备具有高迁移率和良好器件稳定性的共轭聚合物OFET仍然是一个挑战。在本文中，我们报道了一种用于提高电荷迁移率和器件稳定性的超支化聚合物方法。通过线性烷基侧链连接基设计并合成了三种基于超支化二酮吡咯并吡咯的聚合物。结果表明，二维拓扑超支化聚合物形成稳定的薄膜微结构，从而提高了器件稳定性，这是因为共轭部分通过线性烷基链相互连接。此外，引入线性烷基链而非支化烷基链减少了空间位阻，改善了微结构有序性以及电荷迁移率。刮刀涂布OFET的结果表明，器件的迁移率和操作稳定性（偏置稳定性和抗弯曲性）均得到了提高。所有这些都表明超支化聚合物是未来应用的潜在候选材料。
