Superlattice structure including two-dimensional material and device including the superlattice structure

A lateral two-dimensional (2D) superlattice structure, comprising:

• at least two 2D materials that are different from each other and coherently bonded to each other in a lateral direction,
• an interfacial region of the at least two 2D materials being strained,
• the lateral 2D superlattice structure having a bandgap adjusted by the interfacial region that is strained such that a bandgap of the interfacial region is between a first bandgap of a first 2D material and a second bandgap of a second 2D material among the at least two 2D materials that are different from each other, the first 2D material and the second 2D material being coherently bonded to each other at the interfacial region, wherein
• the first 2D material is a first 2D transition metal dichalcogenide (TMDC) material,
• the second 2D material is a second 2D TMDC material,
• the first 2D TMDC material has the first bandgap in an intrinsic state thereof,
• the second 2D TMDC material has the second bandgap in an intrinsic state thereof,
• the bandgap of the interfacial region and an adjacent region have a third bandgap that is between the first bandgap and the second bandgap,
• the interfacial region of the at least two 2D materials has a lattice mismatch of 10% or less, and
• the interfacial region has a bandgap variation rate of 30% or less with respect to one of the at least 2D materials.