A two-dimensional MoS₂/C₃N broken-gap heterostructure, a first principles study

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Van der Waals (vdW) heterojunctions are crucial for next-generation 2D electronic and optoelectronic devices.
• Understanding the electronic properties of layered materials is key to designing novel devices.

Purpose of the Study:

• To investigate the atomic and electronic properties of MoS₂/C₃N vdW heterojunctions.
• To explore the impact of strain and electric fields on the heterostructure's band alignment.

Main Methods:

• First-principles calculations were employed to simulate the heterostructure.
• Analysis of band structure, band gaps, and electronic alignment.

Main Results:

• The MoS₂/C₃N vdW heterostructure exhibits a type III alignment with no band gap overlap.
• It is characterized as a broken-gap heterojunction.
• Biaxial strain and electric fields can tune band overlap but not the alignment type.

Conclusions:

• The MoS₂/C₃N heterostructures are well-suited for tunneling devices due to their broken-gap nature.
• This research provides insights into designing 2D electronic devices with specific band alignments.