Fabrication of Microcavity and Quantum Wells Composed of Two-Dimensional and Three-Dimensional Materials

Emerging nanomaterials have attracted much attention due to their novel functionalities, but have also been hindered by lack of scalable synthesis and of ways of controlling characteristics. Atomically thin two-dimensional (2D) materials are good examples of novel materials set promising exotic properties and requiring established manufacturing approaches for practical applications. Heterostructuring is a powerful and general strategy to control physical properties of materials. Moreover, heterostructuring can offer novel characteristics differentiating the heterostructure from individual component in a structure. Recently, 2D/2D heterostructures prepared by stacking are being explored to observe quantum phenomena. Besides the 2D/2D heterostructures, heterostructuring with 2D and conventional materials in other dimensions (e.g. bulk-like structure for 3D and nanowires for 1D) has shown great potential for multi-dimensional heterostructures.<br/>In this presentation I’ll discuss how to prepare multi-dimensional heterostructures composed of 2D and conventional semiconducting materials. The experimental approach is remote epitaxial growth ZnO on 2D materials including graphene, hexagonal boron nitride, transition metal dichalcogenides. Hydrothermal synthesis, metalorganic chemical vapor deposition, and pulsed laser deposition were employed to fabricate microcavities and quantum wells embedding monolayer molybdenum disulfide layers. Cross-sectional transmission electron microscopy, microphotoluminescence, cathodoluminescence, and electron beam induced current microscopy measurements were utilized to investigate the interfacial structures and functional properties of the heterostructures with high spatial resolution.