National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Department of Mechanical Engineering, The University of Hongkong, Pok Fu Lam Road, Hong Kong, China.
Nat Commun. 2021 Mar 26;12(1):1928. doi: 10.1038/s41467-021-22192-2.
The development of organic thin-film transistors (OTFTs) with low power consumption and high gain will advance many flexible electronics. Here, by combining solution-processed monolayer organic crystal, ferroelectric HfZrO gating and van der Waals fabrication, we realize flexible OTFTs that simultaneously deliver high transconductance and sub-60 mV/dec switching, under one-volt operating voltage. The overall optimization of transconductance, subthreshold swing and output resistance leads to transistor intrinsic gain and amplifier voltage gain over 5.3 × 10 and 1.1 × 10, respectively, which outperform existing technologies using organics, oxides and low-dimensional nanomaterials. We further demonstrate battery-powered, integrated wearable electrocardiogram (ECG) and pulse sensors that can amplify human physiological signal by 900 times with high fidelity. The sensors are capable of detecting weak ECG waves (undetectable even by clinical equipment) and diagnosing arrhythmia and atrial fibrillation. Our sub-thermionic OTFT is promising for battery/wireless powered yet performance demanding applications such as electronic skins and radio-frequency identification tags, among many others.
具有低功耗和高增益的有机薄膜晶体管 (OTFT) 的发展将推动许多柔性电子产品的进步。在这里，通过结合溶液处理的单层有机晶体、铁电 HfZrO 栅极和范德华制造，我们实现了在 1 伏工作电压下同时具有高跨导和低于 60 mV/dec 的开关的柔性 OTFT。跨导、亚阈值摆幅和输出电阻的整体优化导致晶体管固有增益和放大器电压增益分别超过 5.3×10 和 1.1×10，超过了使用有机物、氧化物和低维纳米材料的现有技术。我们进一步展示了电池供电、集成的可穿戴心电图 (ECG) 和脉搏传感器，它们可以以高保真度放大人体生理信号 900 倍。这些传感器能够检测到微弱的 ECG 波（甚至临床设备也无法检测到），并诊断心律失常和心房颤动。我们的亚热离子 OTFT 有望应用于电池/无线供电但性能要求较高的应用，如电子皮肤和射频识别标签等。
