Investigation of CVD Growth of 2D MoS2 on MXene Structures with Photoluminescence Mapping and Fluorescence Lifetime Imaging Microscopy

Abstract

Molybdenum disulfide (MoS2) and molybdenum carbide (Mo2C) are 2D materials with unique properties that make them suitable for electronic and optoelectronic applications. MoS2 is known for its high optical quantum yield and strong light–matter interaction, while Mo2C has metallic properties and is a member of the relatively new class of 2D materials called MXenes. In this research, a new heterostructure is obtained by growing MoS2 directly on Mo2C for the first time using chemical vapor deposition method. This novel hybrid structure changes the interlayer interaction and excited‐state dynamics, thereby increasing material diversity. The structure is characterized using Raman spectroscopy and atomic force microscopy, while photoluminescence (PL) and fluorescence lifetime imaging microscopy measurements are used to examine exciton motions. This study shows that the thickness of the hybrid structure is directly proportional to the frequency difference between the E2g and A1g modes, and inversely proportional to the PL intensities. The hybrid structure displays distinct exciton transitions due to the metallic effect and a longer fluorescence lifetime when compared to the bare monolayer of MoS2. The introduction of this novel hybrid structure with its optical properties holds great potential in opening up new avenues for optoelectronic device applications.