Improved light emission of MoS2 monolayers by constructing AlN/MoS2 core–shell nanowires

Abstract

Hybrid structures composed of layered two-dimensional (2D) transitional metal dichalcogenides have received tremendous attention due to their exceptional tunable optical, electronic, and catalytic properties. In this article, we report the fabrication and novel enhanced photoluminescence (PL) properties of AlN/MoS₂ core–shell nanowires. The morphology and composition of the as-prepared AlN/MoS₂ core–shell heterostructures were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. PL measurements showed that the PL emission of the AlN/MoS₂ heterostructures was enhanced with a blue-shift in comparison to that of the MoS₂ monolayer grown on a Si/SiO₂ substrate. The PL enhancement of the AlN/MoS₂ heterostructures was mainly attributed to charge transfer across the interface of the heterostructure. The results presented here provide novel insights into the PL enhancement of MoS₂ monolayers.