The impact of substrate surface defects on the properties of two-dimensional van der Waals heterostructures
Cited 0 times inCited 0 times in
- The impact of substrate surface defects on the properties of two-dimensional van der Waals heterostructures
- Kim, Se-Yang; Kim, Jung Hwa; Lee, Sungwoo; Kwak, Jinsung; Jo, Yongsu; Yoon, Euijoon; Lee, Gun-Do; Lee, Zonghoon; Kwon, Soon-Yong
- Issue Date
- ROYAL SOC CHEMISTRY
- NANOSCALE, v.10, no.40, pp.19212 - 19219
- The recent emergence of vertically stacked van der Waals (vdW) heterostructures provides new opportunities for these materials to be employed in a wide range of novel applications. Understanding the interlayer coupling in the stacking geometries of the heterostructures and its effect on the resultant material properties is particularly important for obtaining materials with desirable properties. Here, we report that the atomic bonding between stacked layers and thereby the interlayer properties of the vdW heterostructures can be well tuned by the substrate surface defects using WS2 flakes directly grown on graphene. We show that the defects of graphene have no significant effect on the crystal structure or the quality of the grown WS2 flakes; however, they have a strong influence on the interlayer interactions between stacked layers, thus affecting the layer deformability, thermal stability, and physical and electrical properties. Our experimental and computational investigations also reveal that WS2 flakes grown on graphene defects form covalent bonds with the underlying graphene via W atomic bridges (i.e., formation of larger overlapping hybrid orbitals), enabling these flakes to exhibit different intrinsic properties, such as higher conductivity and improved contact characteristics than heterostructures that have vdW interactions with graphene. This result emphasizes the importance of understanding the interlayer coupling in the stacking geometries and its correlation effect for designing desirable properties.
- Appears in Collections:
- MSE_Journal Papers
- Files in This Item:
- There are no files associated with this item.
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.