Defects in 2D layered TMDCs materials: Influence on photoelectric properties and their applications

Abstract

Two-dimensional (2D) layered transition metal dichalcogenides (TMDCs) materials have the advantages of strong light-matter interaction, high carrier mobility, and adjustable band gap, which promoted the development of optoelectronic devices. However, defects will inevitably be introduced into TMDCs materials, whether naturally exfoliated or artificially synthesized. The existence of defect will change the characteristics of the material, such as band gap, light absorption, carrier mobility, etc., and further affect the performance of TMDCs-based optoelectronic devices. Therefore, it is of great significance to in-depth understanding the types, formation causes, and the effect on the photoelectric properties of materials, and apply defect engineering to high-performance optoelectronic devices. In this paper, we reviewed the research on defects in 2D TMDCs materials in recent years, focusing on the types and causes of defects, and summarizing the characterization methods of defects. Subsequently, the influence and mechanism of defects on the materials are discussed in detail. Finally, the application of defect engineering in TMDCs-based optoelectronic devices is explored. This review provides a prospective perspective for the applications of defect control in optoelectronic devices.