电介质的协同极化工程,实现低电压高移动性溶液加工超柔性有机晶体管

IF 12.3 1区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC npj Flexible Electronics Pub Date : 2024-05-10 DOI:10.1038/s41528-024-00316-0
Mingxin Zhang, Xue Wang, Jing Sun, Yanhong Tong, Cong Zhang, Hongyan Yu, Shanlei Guo, Xiaoli Zhao, Qingxin Tang, Yichun Liu
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引用次数: 0

摘要

新兴的可穿戴类皮肤电子产品要求超柔性有机晶体管在低电压下工作,以确保电气安全和能源效率,同时实现高场效应迁移率,以确保载流子迁移能力和电路开关速度。然而,目前报道的低压有机晶体管普遍存在迁移率低的问题,这源于电介质的分子极性和表面极性之间的权衡。在这项工作中,通过引入柔性季铵侧链,增强了电介质的取向极性,而非极性甲基对极性氮原子的屏蔽作用则削弱了表面极性。由此产生的反溶剂 QPSU 电介质实现了高达 18.8 的高介电常数和低表面极性,表面能的极性分量仅为 2.09 mJ/m2。这种取向极化和表面极性之间的协同极化工程使溶液加工的超柔性晶体管具有低至 -3 V 的超低工作电压、1 Hz 时高达 8.28 cm2 V-1 s-1 的超高电荷载流子迁移率、出色的循环工作稳定性和长期空气稳定性。这些结果与低至 135 nm 的超薄晶体管厚度、0.5 g/m2 的超轻质量、在人体皮肤和 1-μm 叶片边缘上的保形附着能力,以及在 30,000 次弯曲循环中保持稳定电特性的强大机械鲁棒性相结合,为成功实现低电压高迁移率溶液加工有机晶体管开辟了一种可用的策略,并展示了 QPSU 电介质在下一代可穿戴、不易察觉的类肤电子产品中的潜在应用。
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Synergistic polarization engineering of dielectric towards low-voltage high-mobility solution-processed ultraflexible organic transistors
The emerging wearable skin-like electronics require the ultra-flexible organic transistor to operate at low voltage for electrical safety and energy efficiency and simultaneously enable high field-effect mobility to ensure the carrier migration ability and the switching speed of circuits. However, the currently reported low-voltage organic transistors generally present low mobility, originating from the trade-off between molecular polarity and surface polarity of the dielectrics. In this work, the orientation polarization of the dielectric is enhanced by introducing a flexible quaternary ammonium side chain, and the surface polarity is weakened by the shielding effect of the nonpolar methyl groups on the polar nitrogen atom. The resulting antisolvent QPSU dielectric enables the high-dielectric constant up to 18.8 and the low surface polarity with the polar component of surface energy only at 2.09 mJ/m2. Such a synergistic polarization engineering between orientation polarization and surface polarity makes the solution-processed ultraflexible transistors present the ultralow operational voltage down to −3 V, the ultrahigh charge-carrier mobility up to 8.28 cm2 V−1 s−1 at 1 Hz, excellent cyclic operational stability and long-term air stability. These results combined with the ultrathin thickness of transistor as low as 135 nm, the ultralight mass of 0.5 g/m2, the conformal adherence capability on human skin and 1-μm blade edge, and the strong mechanical robustness with stable electrical properties for 30,000 bending cycles, open up an available strategy to successfully realize low-voltage high-mobility solution-processed organic transistor, and presents the potential application of QPSU dielectric for the next-generation wearable imperceptible skin-like electronics.
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来源期刊
CiteScore
17.10
自引率
4.80%
发文量
91
审稿时长
6 weeks
期刊介绍: npj Flexible Electronics is an online-only and open access journal, which publishes high-quality papers related to flexible electronic systems, including plastic electronics and emerging materials, new device design and fabrication technologies, and applications.
期刊最新文献
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