4:15 PM - 4:30 PM
▲ [13p-A37-9] hBN-encapsulated Group-VI TMDC van der Waals Heterostructures : Fabrication and Optical properties
Keywords:TMDC, Heterostructure, Optical properties
Van der Waals (vdW) heterostructures composed of these 2D semiconductors, such as WS2/MoS2, offer a novel platform for optical physics, where strong inter-layer interaction drastically alters optical transitions. To explore the intrinsic properties of TMDC vdW heterostructures, high-quality samples are indispensable. Here, we report preparation and optical properties of high-quality vdW heterostructure (WS2/MoS2) which are fully encapsulated by hexagonal boron nitride (hBN)
We synthesized monolayer MoS2 and WS2 by chemical vapor deposition method and prepared thin hBN flakes by mechanical exfoliation method. hBN-encapusulated heterostuructures (hBN/WS2/MoS2/hBN) were prepared with the polymer-assisted dry-transfer method. And fabricated heterostructure showed sharp interlayer exciton peak rather than previous report. This clearly demonstrates that the quality of the fabricated is high. The results obtained in this work indicate the importance of hBN encapsulation in investigation of intrinsic physical properties of TMDC and its vdW heterostructures.
We synthesized monolayer MoS2 and WS2 by chemical vapor deposition method and prepared thin hBN flakes by mechanical exfoliation method. hBN-encapusulated heterostuructures (hBN/WS2/MoS2/hBN) were prepared with the polymer-assisted dry-transfer method. And fabricated heterostructure showed sharp interlayer exciton peak rather than previous report. This clearly demonstrates that the quality of the fabricated is high. The results obtained in this work indicate the importance of hBN encapsulation in investigation of intrinsic physical properties of TMDC and its vdW heterostructures.