Static and Dynamic Piezopotential Modulation in Piezo-Electret Gated MoS ₂ Field-Effect Transistor

The piezotronic effect links the mechanical stimuli with various semiconductor devices, promising for low-power-consuming electronic devices, sensitive sensors, and interactive control systems. The persistent requirement for external strains in piezotronic modulation may hinder its application in some circumstances (such as devices on rigid substrate or complicated synergistic piezoelectric modulation on multidevice). Here, we propose an efficient method to realize piezoelectric modulation of optical and electrical properties of MoS ₂ FET in both static and dynamic manner, expanding the application of piezotronics. Through capacitive coupling between piezo-electret and MoS ₂ FET, the remanent piezo-potential can efficiently tune the Fermi level of MoS ₂ , programming the initial electrical property for subsequent fabrication of sophisticated devices. The external strain can induce enhanced piezo-potentials to further affect the energy band bending of MoS ₂ channel, giving rise to high-performance strain sensors (large gauge factor â4800, fast response time â0.15 s, and good durability >1000 s). The proposed static and dynamic piezopotential tuned MoS ₂ FET is easy to extend to devices based on other materials, which is highly desired in tunable sensory systems, active flexible electronics, and human-machine interface.