Phase engineering of MoS₂ through GaN/AlN substrate coupling and electron doping.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional molybdenum disulfide (MoS₂) exhibits polymorphism, offering potential for novel nanoelectronic applications.
• Controllable phase engineering of MoS₂ is crucial for realizing its full potential in advanced devices.

Purpose of the Study:

• To introduce a flexible and controllable method for engineering the phase stability of MoS₂.
• To investigate the influence of substrate interfacing on MoS₂ phase transitions.

Main Methods:

• First-principles calculations were employed to study MoS₂ interactions with GaN and AlN substrates.
• The effect of substrate surface termination and electron doping on MoS₂ phase stability was analyzed.

Main Results:

• Interfacing MoS₂ with GaN or AlN substrates allows for controllable phase engineering, yielding either the 2H or 1T' (1T'') phase.
• Substrate-MoS₂ interface coupling influences phase transition kinetics.
• Electron doping provides an additional pathway for modulating MoS₂-substrate interactions and phase control.

Conclusions:

• A novel route for phase engineering of MoS₂ via substrate interfacing has been established.
• Findings advance the understanding of MoS₂ phase behavior and facilitate the design of hybrid 2D/3D nanodevices.