Synthesis and Characterization of Transition Metal Dichalcogenide Nanoribbons Based on a Controllable O Etching.

Although the synthesis of monolayer transition metal dichalcogenides has been established in the last decade, synthesizing nanoribbons remains challenging. In this study, we have developed a straightforward method to obtain nanoribbons with controllable widths (25-8000 nm) and lengths (1-50 μm) by O etching of the metallic phase in metallic/semiconducting in-plane heterostructures of monolayer MoS. We also successfully applied this process for synthesizing WS, MoSe, and WSe nanoribbons.

Observation of the photovoltaic effect in a van der Waals heterostructure.

van der Waals (vdW) heterostructures, which can be assembled with various two-dimensional materials, provide a versatile platform for exploring emergent phenomena. Here, we report an observation of the photovoltaic effect in a WS/MoS vdW heterostructure. Light excitation of WS/MoS at a wavelength of 633 nm yields a photocurrent without applying bias voltages, and the excitation power dependence of the photocurrent shows characteristic crossover from a linear to square root dependence.