Insights Into the Two-Dimensional MoS2 Grown on AlGaN(GaN) Substrates by CVD Method

Two-dimensional (2D) MoS
₂
was grown on AlGaN(GaN) substrates by chemical vapor deposition (CVD) and 2D-3D MoS
₂
-AlGaN(GaN) heterostructures were formed. The MoS
₂
crystal on AlGaN surface has a mixed and irregular shape including single and multiple layers, while the single layer of triangular MoS
₂
is basically prepared on GaN surface. Combined with theoretical first-principles analysis, it is found the adsorption of AlGaN to MoS
₂
is lower than that of GaN, which leads to the deposition of MoS
₂
molecules on AlGaN surface, forming multilayer shapes. In addition, Both the MoS
₂
-AlGaN(GaN) heterostructures exhibit indirect band gaps and broad-band light absorption performances.