Optical properties in 1L-MoS2 and enhancements through thermal treatments

Abstract

Transition metal dichalcogenides as monolayer molybdenum disulphide (1L − MoS2) are highly appealing due to their unique properties. 1L − MoS2 exhibits excellent charge-carrier mobility and light-absorption capabilities. When excited by visible light, it emits through exciton recombination, leading to intense photoemission around 1.8 eV. External factors, including production route and interactions with the external environment, significantly inf luence these optical characteristics. However, these factors can be manipulated to enhance photoluminescence. This study demonstrates that thermal treatments under controlled atmospheres predictably modify 1L − MoS2’s electronic and structural properties while tuning its emission. The enhanced optical properties suggest that post-synthetic procedures can address limitations in production routes. Our findings aim to deepen the understanding of 1L−MoS2’s properties and explore ways to control its optical capabilities, enabling tailored heterostructure devices through versatile post-synthetic treatments.