2-D materials have special lattice structures. Atoms in the same layer are usually bound by a covalent bond, while the force between layers is van der Waals coupling. They have super-clean surfaces without any dangling bonds. Thus, the design of heterojunctions is more flexible when 2-D materials are utilized to constitute heterojunctions. The heterojunctions formed by different 2-D materials have advantageous properties, including optimizing band alignment, bandgap, charge transfer and optical properties.

Via:: https://phys.org/news/2017-11-factors-fabrication-heterojunctions-d-materials.html

Factors in the fabrication of heterojunctions of 2-D materials through CVD

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