High-Performance WS₂ Monolayer Light-Emitting Tunneling Devices Using 2D Materials Grown by Chemical Vapor Deposition

Abstract

The solid progress in the study of a single two-dimensional (2D) material underpins the development for creating 2D material assemblies with various electronic and optoelectronic properties. We introduce an asymmetric structure by stacking monolayer semiconducting tungsten disulfide, metallic graphene, and insulating boron nitride to fabricate numerous red channel lightemitting devices (LEDs). All the 2D crystals were grown by chemical vapor deposition (CVD), which has great potential for future industrial scale-up. Our LEDs exhibit visibly observable electroluminescence (EL) at both 5.5 V forward and 7.0 V backward biasing, which correlates well with our asymmetric design. The red emission can last for at least several minutes, and the success rate of the working device that can emit detectable EL is up to 80%. In addition, we show that sample degradation is prone to happen when a continuing bias, much higher than the threshold voltage, is applied. Our success of using high-quality CVD-grown 2D materials for red light emitters is expected to provide the basis for flexible and transparent displays.

2D WS2: From Vapor Phase Synthesis to Device Applications

“…It has the relatively high carrier mobility, [ 22 ] large exciton binding energy, [ 23 ] large spin–orbit splitting, [ 24 ] and strong photoluminescence (PL). [ 25 ] These properties make it idle for a wide range of applications, such as transistors, [ 26 ] photodetectors, [ 27 ] light‐emitting devices (LEDs), [ 28 ] etc. Despite the fact that there are numerous reports focused on the synthesis, properties, and applications of 2D WS 2 , there is still a lack of the comprehensive review on 2D WS 2 .…”

High-performance ultra-violet phototransistors based on CVT-grown high quality SnS2flakes

“…have exhibited extraordinary properties in many elds, emerging as suitable candidates for next-generation electronic or photoelectronic systems beyond the current silicon era. [9][10][11][12][13] The surprising and appealing characteristics found in the low-dimensional limit stimulate the exploration of other van der Waals layered materials. [14][15][16] Nowadays, various layered semiconductors can be prepared via top-down (e.g.…”

Synthesis of two‐dimensional transition metal dichalcogenides for electronics and optoelectronics

“…Apart from application in photodetectors and photovoltaics, 2D TMDCs and its heterostructures are also being explored for LED applications 222‐226 . The development of light‐emitting diodes plays a vital role for promoting the advance of lighting, display, optical interconnect, logic, and sensor areas.…”