Advances in Two-Dimensional Magnetic Semiconductors via Substitutional Doping of Transition Metal Dichalcogenides

Abstract

Transition metal dichalcogenides (TMDs) are two-dimensional (2D) materials with remarkable electrical, optical, and chemical properties. One promising strategy to tailor the properties of TMDs is to create alloys through a dopant-induced modification. Dopants can introduce additional states within the bandgap of TMDs, leading to changes in their optical, electronic, and magnetic properties. This paper overviews chemical vapor deposition (CVD) methods to introduce dopants into TMD monolayers, and discusses the advantages, limitations, and their impacts on the structural, electrical, optical, and magnetic properties of substitutionally doped TMDs. The dopants in TMDs modify the density and type of carriers in the material, thereby influencing the optical properties of the materials. The magnetic moment and circular dichroism in magnetic TMDs are also strongly affected by doping, which enhances the magnetic signal in the material. Finally, we highlight the different doping-induced magnetic properties of TMDs, including superexchange-induced ferromagnetism and valley Zeeman shift. Overall, this review paper provides a comprehensive summary of magnetic TMDs synthesized via CVD, which can guide future research on doped TMDs for various applications, such as spintronics, optoelectronics, and magnetic memory devices.

Engineered Two-Dimensional Transition Metal Dichalcogenides for Energy Conversion and Storage

“…Doping has been reported to effectively tune the energy of hydrogen adsorption on TMDs by modulating the energy levels. 95 Morphology of MoS 2 nanoclusters were significantly altered due to Co-doping, thereby truncating them. Experiments on Mo and S edges of Co-, Ni-, Cu-, and Fe-doped MoS 2 show the hydrogen adsorption energy is significantly modified by the presence of heteroatoms.…”

“…These alterations can result in increased surface area and changes in the populations of edge sites for catalytic reactions. Doping has been reported to effectively tune the energy of hydrogen adsorption on TMDs by modulating the energy levels . Morphology of MoS 2 nanoclusters were significantly altered due to Co-doping, thereby truncating them.…”

Electrical, optical and mechanical properties of monolayer MoTe2 for applications in wearable optoelectronic devices

“…Mo vacancy in MoXY (Y = S, Se, Te; X not equal Y) can effectively modulate the ORR activity of Janus TMDs [21]. Lastly, a dopant-induced modification can influence the optical and magnetic properties of TMDs [22].…”

A novel two-dimensional NiCl2O8 lattice with negative Poisson's ratio and magnetic modulation

“…Two-dimensional (2D) magnetic semiconductors, 1–4 which combine properties like semiconductivity, magnetism, and low dimensionality, hold significant promise for future applications, including but not limited to quantum computation, 5 high-frequency devices, 6 high-density information storage, 7 and so on. In the past decade, researchers have mostly focused on traditional 2D inorganic magnetic semiconductors with transition metals, such as experimentally synthesized CrI 3 , 8,9 Cr 2 Ge 2 Te 6 , 10 Fe 3 GeTe 2 , 11,12 VSe 2 , 13 and CrBr 3 , 14,15 as well as theoretically predicted CrOCl, 16,17 CrWI 6 17 and CdI 2 .…”