Layer number dependent optical and electrical properties of CVD grown two-dimensional anisotropic WS2

Growth and Optoelectronic Properties of Large-Scale Bilayer WS2 Ribbons with Unusual Shapes via Chemical Vapor Deposition

“…Similarly, as plotted in Figure d, the V CPD values of lines 1–3 at the edge of the single-layer WS 2 flake, as marked in Figure c, are ∼206, ∼208, and ∼211 mV, respectively, and the work function of the monolayer WS 2 crystal is calculated to be ∼4.692 eV. Therefore, a bilayer WS 2 flake exhibits ∼0.05 eV higher work function than that of a monolayer WS 2 crystal, and the increasing work function with the increase of layer number is also mentioned in the reported literature of MoS 2 and WS 2 crystals with different layer numbers, which is explained by the interlayer screening effect. − The surface potential of thin films is screened by a substrate-induced electric field. With the increase of layer number of 2D TMDC crystals, the screening effect will gradually weaken and the surface potential shows a decreasing trend too close to bulk values.…”

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS2 on sapphire substrate

“…After the completion of growth, the sample was cooled down to room temperature with natural furnace cooling. 23 This growth was found to be very sensitive to gas purity and humidity.…”

WS2 Monolayer for Piezo–Phototronic Dye Degradation and Bacterial Disinfection

“…For the last 2 decades, two-dimensional (2D) nanomaterials based on transition-metal dichalcogenide (TMDC) are in the focus of scientific experts because of the multifunctionality of these novel materials . These atomically thin wonder materials exhibit a wide range of optical, electrical, and mechanical properties. − The semiconductor phase of these 2D nanomaterials shows a layer-number-dependent band gap and undergoes a transition from indirect-to-direct band gap while thinning from a bulk layer to a monolayer. − The noncentrosymmetric 2D materials have reported great potential for energy harvesting as a result of the piezoelectric response. Integration between the mechanical and electrical performances along with the ability to couple piezoelectric polarization with light permits productive mechanical-to-electrical energy conversion more efficiently.…”