WSe₂ 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications

Abstract

The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications. WSe2 belongs to a family of transition‐metal dichalcogenides. Similar to graphene, WSe2 and analogous dichalcogenides have layered structures with weak van der Waals interactions between two adjacent layers. First, the readers are presented with the fundamentals of WSe2, such as types, morphologies, and properties. Here, we report the characterization principles and practices such as microscopy, spectroscopy, and diffraction. Second, the methods for obtaining high‐quality WSe2, such as exfoliation, hydrothermal and chemical vapor deposition, are briefly listed. With advantages of light weight, flexibility, and high quantum efficiency, 2D materials may have a niche in optoelectronics as building blocks in p‐n junctions. Therefore, we introduce a state‐of‐the‐art demonstration of heterostructure devices employing the p‐type WSe2 semiconductor. The device architectures include field‐effect transistors, photodetectors, gas sensors, and photovoltaic solar cells. Due to its unique electronic, optical, and energy band properties, WSe2 has been increasingly investigated due to the conductivity of the p‐type charge carrier upon palladium contact. Eventually, the dynamic research on WSe2 and van der Waals heterostructures is summarized to arouse the passion of the 2D research community.image

Record‐Low Subthreshold‐Swing Negative‐Capacitance 2D Field‐Effect Transistors

“…Focusing on the supply voltage, a grounding saturation for future CMOS scaling devices. [22][23][24] To date, several TMDbased 2D NC-FETs with sub-60 mV dec −1 switching have been demonstrated using ferroelectric P(VDF-TrFE) polymer, hafnium zirconium oxide (HZO), and 2D CuInP 2 S 6 (CIPS). [13][14][15][16][17] However, till now, only HZO-based gate stack 2D NC-FETs can obtain ultralow SS (<10 mV dec −1 ) and quasi-free hysteresis simultaneously.…”

2D Polarized Materials: Ferromagnetic, Ferrovalley, Ferroelectric Materials, and Related Heterostructures

“…[ 22–25 ] And thus the band structure in 2D materials, corresponding to the optical and transfer behavior of DOFs, are modulated. [ 26–29 ] By constructing polarized heterostructures with ultraclean interfaces, various proximity effects and devices have been demonstrated, where the polarization penetrates into the neighboring nonpolarized layer. Usually these heterostructures possess greatly enhanced polarization behavior than pristine materials.…”

The tunable electric and magnetic properties of 2D MXenes and their potential applications

“…Until 100 kinds of MXenes have been discovered through ab-initio calculation, more than 25 types of MXene could be obtained 22 . Several research papers and reviews belonging to photonics, optoelectronics, photothermal therapy, energy conversion, and storage applications of 2D MXene-based materials have been reported [42][43][44][45] . 25,[46][47][48][49][50] .…”