Abstract
Abstract The discovery of two-dimensional (2D) materials has opened up new frontiers and challenges for exploring fundamental research. Recently, single-layer (SL) transition metal dichalcogenides (TMDCs) have emerged as candidate materials for electronic and optoelectronic applications. In contrast to graphene, SL TMDCs have sizable band gaps that change from indirect to direct in SLs, which is useful in making thinner and more efficient electronic devices, such as transistors, photodetectors, and electroluminescent devices. In addition, SL TMDCs show strong spin-orbit coupling effects at the valence band edges, giving rise to the observation of valley-selective optical excitations. Here, we review the basic electronic and optical properties of pure and defected group-VIB SL TMDCs, with emphasis on the strong excitonic effects and their prospect for future optoelectronic devices.
Highlights
Thin materials have attracted a great deal of attention since they exhibit rich and intriguing properties that have been impossible to extract from their bulk counterparts
We present an overview of the basic electronic and optical properties of pure and defected SL transition metal dichalcogenides (TMDCs), with emphasis on their possible applications in future optoelectronic and photonic devices
SL TMDCs exhibit a number of exciting properties such as high optical response due to the direct band gap, band gap tunability, and strong spin-orbit coupling (SOC) together with valley structure leading to circular dichroism, which are important both for fundamental research and for industrial applications
Summary
Thin materials have attracted a great deal of attention since they exhibit rich and intriguing properties that have been impossible to extract from their bulk counterparts. In SL WSe2, the exciton binding energy has been determined to be 0.37 eV, which is about an order of magnitude larger than the one observed in III–V semiconductor quantum wells, and renders the exciton excited states observable even at room temperature [23] In this short review, we first present electronic and optical properties of SL TMDCs. we present a survey of the hitherto reported point defects in SL TMDCs. we present a survey of the hitherto reported point defects in SL TMDCs This includes point defects, line defects, and heterostructures of different SL TMDCs. We will discuss the formation of defects and their influence on the electronic and optical properties of SL TMDCs. We will briefly review recent progress in optoelectronics and photonics applications of defected TMDCs. we will discuss the major challenges and future opportunities in this rapidly progressing field of research
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