On-Device Pressure-Tunable Moving Schottky Contacts
Zhaokuan Yu, Xuanyu Huang, Jinbo Bian, Yuqing He, Xin Lu, Quanshui Zheng, Zhiping Xu
Abstract
Contact engineering enhances electronic device performance and functions but often involves costly, inconvenient fabrication and material replacement processes. We develop an in situ, reversible, full-device-scale approach to reconfigurable 2D van der Waals contacts. Ideal p-type Schottky contacts free from surface dangling bonds and Fermi-level pinning are constructed at structurally superlubric graphite-MoS 2 interfaces. Pressure control is introduced, beyond a threshold of which tunneling across the contact can be activated and amplified at higher loads. Record-high figures of merits such an ideality factor nearing 1 and an off-state current of 10 –11 A were reported. The concept of on-device moving contacts is demonstrated through a wearless Schottky generator, operating with an optimized overall efficiency of 50% in converting weak, random external stimuli into electricity. The device combines generator and pressure-sensor functions, achieving a high current density of 31 A/m 2 and withstanding over 120,000 cycles, making it ideal for neuromorphic computing and mechanosensing applications.