Evolution of Excitonic Species of Nano-Interfaces in Mo_xW_1-xS₂ Monolayer Heterostructures

Here, a Mo_xW_1-xS₂ is synthesized using A liquid-phase precursor-assisted synthesis approach which results in Mo_xW_1-xS₂ in-plane heterostructures possessing a Mo-rich center and a W-rich edge region, with an alloyed 2D interface of ~100 nm width. According to the detailed spectral analysis of the photoluminescence spectra as a function of temperature (4K-300K) and laser excitation intensities, the evolution of the A exciton, B exciton, and Trion of different regions in the Mo_xW_1-xS₂ in-plane heterostructures are comparable with the reported values for the pristine MoS₂ and WS₂. And, the sharp interface region combines both excitonic specious of the MoS₂ and WS₂. Besides, first-principles calculations is performed to address the effect of the spin-orbit interaction in Mo_xW_1-xS₂ to understand the evolution of the A and B excitons. Our research underscores the possibility of concurrently engineering optical properties to create innovative devices utilizing these 2D monolayers and opens up significant potential for various practical applications.