Yu Zhaokuan, Xiao Yangfan, Huang Xuanyu, Liu Chenleyang, He Yuqing, Ma Ming
Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, People's Republic of China.
J Phys Condens Matter. 2024 Jun 17;36(37). doi: 10.1088/1361-648X/ad5507.
Super microgenerator (SMG) refers to a generator that can efficiently convert extremely weak external stimuli into electrical energy and has a small size, high power density and long lifespan, offer ground-breaking solutions for powering wearable devices, wireless distributed sensors and implanted medical equipment. However, the friction and wear between the interfaces of ordinary microgenerator results in an extremely low lifespan. Here, we present a prototype of SMGs based on a 2D-2D (graphite-MoS) Schottky contact in the state of structural superlubricity (no wear and nearly zero friction between two contacted solid surfaces). What is even more interesting is when the graphite flake is slid from the bulk to the edge of MoS, the output current will enhance from 31 to 56 A m. Through the I-V curve measurement, we found that the conductive channel across the junction can be activated and further enhanced at the edge of MoScompare to bulk, which provide the explanation for the above-mentioned edge enhancement of power generation. Above results provide the design principles of high-performance SMGs based on 2D-2D Schottky junctions.
超级微型发电机（SMG）是指一种能够将极其微弱的外部刺激高效转换为电能的发电机，具有体积小、功率密度高和寿命长的特点，为可穿戴设备、无线分布式传感器和植入式医疗设备供电提供了开创性的解决方案。然而，普通微型发电机界面之间的摩擦和磨损导致其寿命极低。在此，我们展示了一种基于二维-二维（石墨-MoS）肖特基接触处于结构超润滑状态（两个接触固体表面之间无磨损且摩擦力几乎为零）的SMG原型。更有趣的是，当石墨薄片从MoS的块状部分滑向边缘时，输出电流将从31 A/m提高到56 A/m。通过I-V曲线测量，我们发现与块状部分相比，穿过结的导电通道在MoS边缘可以被激活并进一步增强，这为上述发电的边缘增强提供了解释。上述结果提供了基于二维-二维肖特基结的高性能SMG的设计原理。
