Two-dimensional monolayer transition metal dichalcogenides have attracted a lot of attention owing to their excellent physical properties. The significant polarization field induced by external strain within two-dimensional piezoelectric semiconductor materials can effectively regulate the properties of the materials. In this article, the edge-state of MoS2/WS2 lateral heteroribbon has been theoretically investigated by three-orbital tight-binding model. And the piezotronic effect on the edge state is also studied. The external in-plane stress can induce a metallic-to-semiconducting phase transition. This study offers an effective way to module the electric properties of lateral heterostructure.
Wireless self-powered sensors are necessary for long-term, large-scale, real-time environmental monitoring systems. Triboelectric nanogenerators can capture energy from the environment to power sensors. However, fewer works that directly transform energy into wireless sensing signals, and the majority of existing environmental sensors require energy storage devices to store energy. Direct-driven wireless self-powered sensing is further limited by low energy density in the environment. In this paper, we present a wireless humidity sensor system that is suitable for ambient energy harvesting. This method can be used in self-powered ambient energy harvesting devices to convert and modulate environmental energy into a sensing signal without any energy storage devices. The signal is processed by using a machine learning algorithm, and the humidity recognition accuracy can reach 98.7%.
Piezotronics and piezo-phototronics are new emerging fields that have already found applications in nanogenerators, piezoelectric transistors, strain sensors and LEDs. The strain-induced piezoelectric potential plays a crucial role in modulating charge-carrier transport properties in piezoelectric semiconductor materials, especially for two-dimensional (2D) materials. In this work, we theoretically study the piezotronic effect, circularly polarized light and Zeeman field’s impact on the modulation of valley and spin properties in monolayer (ML) MoS2 nanoribbon. We create two ferromagnetic regions in the ML MoS2 nanoribbon to simultaneously manipulate the transport properties of valley and spin using externally applied polarized light and strain. In the proposed junction of ML MoS2, which consists of two barriers modulated by strain, light and Zeeman field, an intriguing coexistence of perfect valley and spin polarization emerges. Our investigation reveals that among these three effects, the huge piezoelectric effect plays a leading role.
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