Two-dimensional transition metal chalcogenides (TMDCs) have broad application prospects in the fields of optoelectronic devices and energy devices. They show excellent optoelectronic properties. They also have unique flexibility and can be used to prepare next-generation flexible wearable devices . Tungsten diselenide (WSe 2 ) is a transition metal diselenide. Similar to graphene, WSe 2 has the characteristics of a layered structure. The WSe 2 bulk material is a semiconductor with an indirect band gap (1.25 eV). The direct band gap width of tungsten selenide is about 1.65 eV, which meets the material requirements of electronic and optoelectronic devices, and has n-type and p-type semiconductor characteristics. Because WSe 2 exhibits p-type charge carrier conductivity when in contact with palladium materials, researches on heterostructure devices of p-type WSe 2 semiconductors are hot.In a review article titled "WSe 2 2D p-type semiconductor-based electronic devices for information technology: design, preparation, and applications"published by Info Team at Jinan University, Jinbo Bo and Liu Hong , a systematic survey The structural properties of the p-type two-dimensional material tungsten diselenide, especially the chemical vapor phase method, metal organic chemical vapor deposition method, etc., can be used to guide innovative design and preparation technologies. Then, the applications of information devices are introduced.This article prospects the research of WSe 2 materials from four perspectives .First, the synthesis strategy of WSe 2 should be continuously optimized . Second, the use of doping strategies or defect engineering can enrich the regulation of charge transport behavior. Third, device arrays and system integration of high-quality WSe 2 materials should be considered . Finally, the basic properties of WSe2 , such as exciton, rotary transport, and energy valley electron transport, have become research hotspots with the development of advanced characterization technologies. These characterization techniques include scanning tunneling microscopes, atomic force microscopes for measuring current, femtosecond time-resolved-pump-probe spectroscopy, electrical probe stations and strong magnetic fields (Hall measurement), magnetic spectroscopy, and in-situ transmission electron microscopy with bias applied . Use electrical control or strain engineering to control charged excitons.

The work was published on InfoMat ( DOI: 10.1002 / inf2.12093 ).

Ji Jinbo , Associate Researcher, Master‘s Supervisor, Institute of Frontier Interdisciplinary Sciences, Jinan University. He mainly researched large-area controllable synthesis and information devices of two-dimensional materials. He has published more than 30 papers, has been cited 1,000 times, and has an H factor of 17.

Liu Hong , professor, doctoral supervisor, was awarded the National Science Fund for Distinguished Young Scholars in 2009. His research interests include nano-energy materials, tissue engineering and stem cell differentiation, and artificial crystal materials. In the past ten years, it has undertaken more than ten national scientific research projects, including major projects of 863, 973, and Natural Science Foundation. Published more than 200 corresponding author articles in Adv. Mater., Etc., more than 30 articles with an impact factor greater than 10, more than 17,000 citations, and an H factor of 62.

Source: MaterialsViews