Achieving effective photoluminescence control in two-dimensional van der Waals transition metal dichalcogenide heterostructures via laser-modified ozone intercalation

The integration of two-dimensional transition metal dichalcogenide (TMD) layers into van der Waals (vdW) heterostructures offers substantial opportunities for both materials synthesis and device design. Interlayer interactions enable desirable functionalities, and manipulating these interactions is essential for optimizing device performance. In this work, we introduce ozone intercalation into vdW heterostructures and adopt laser irradiation as a manipulation tool, creating a photoluminescence (PL)-based modulation type using interface engineering. Interlayer engineering can be quantitatively achieved by precisely controlling the laser modification time, enabling a controllable PL intensity from no quenching to quenching. The mechanism behind this regulation can be attributed to the interlayer exciton suppression introduced by ozone intercalation being repaired by ozone molecule reduction during the laser treatment. This effective regulatory technique is universal and can be achieved in various type II band-aligned TMD heterostructures, providing an intriguing strategy for the design of two-dimensional vdW TMD device systems.