2023, Engineering Anisotropy in 2D Transition Metal Dichalcogenides via Heterostructures, Optics Letters( highlighted as an Editor's Pick.)

2023, Engineering Anisotropy in 2D Transition Metal Dichalcogenides via Heterostructures, Optics Letters

Abstract:

Two-dimensional (2D) semiconductors featuring low-symmetry crystal structures hold immense potential for the design of advanced optoelectronic devices, leveraging their inherent anisotropic attributes. While the synthesis techniques for transition metal dichalcogenides (TMDs) have matured, a promising avenue emerges: the induction of anisotropy within symmetric TMDs through interlayer van der Waals coupling engineering. Here, we unveil the creation of heterostructures (HSs) by stacking highly symmetric MoSe2 with low symmetry ReS2, introducing artificial anisotropy into monolayer MoSe2. Through meticulous analysis of angle-dependent photoluminescence (PL) spectra, we discern a remarkable anisotropic intensity ratio of approximately 1.34. Bolstering this observation, the angle-resolved Raman spectra provide unequivocal validation of the anisotropic optical properties inherent to MoSe2. This intriguing behavior can be attributed to the in-plane polarization of MoSe2, incited by the deliberate disruption of lattice symmetry within the monolayer MoSe2 structure. Collectively, our findings furnish a conceptual blueprint for engineering both isotropic and anisotropic HSs, thereby unlocking an expansive spectrum of applications in the realm of high-performance optoelectronic devices.

Keywords: Transition metal dichalcogenides; anisotropy; van der Waals coupling engineering; angle-resolved Raman spectra.

Link: https://opg.optica.org/ol/abstract.cfm?uri=ol-48-22-5867

Engineering Anisotropy in 2D Transition Metal Dichalcogenides via(1).pdf