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.

新兴的可穿戴类肤电子产品需要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的开关速度。然而，目前报道的低压有机晶体管通常表现出低迁移率，这源于分子极性和电介质表面极性之间的权衡。该工作通过引入柔性季铵侧链增强了电介质的取向极化，并通过非极性甲基对极性氮原子的屏蔽作用减弱了表面极性。所得的抗溶剂QPSU电介质具有高达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/m ²。这种取向极化和表面极性之间的协同极化工程使得溶液处理的超柔性晶体管在1 Hz时呈现低至-3 V的超低工作电压、高达8.28 cm ²  V ^-1  s ^-1的超高载流子迁移率，优异的循环运行稳定性和长期空气稳定性。这些结果与低至135 nm的晶体管超薄厚度、0.5 g/m ²的超轻质量、对人体皮肤和1μm刀刃的保形粘附能力以及强大的机械鲁棒性和稳定的电性能30,000次相结合弯曲循环，开辟了一种成功实现低压高迁移率溶液加工有机晶体管的可用策略，并展示了 QPSU 电介质在下一代可穿戴不可感知类皮肤电子产品中的潜在应用。