Fluorographane: a promising material for bipolar doping of MoS2

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Two-dimensional (2D) materials like graphene and molybdenum disulfide (MoS2) offer unique electronic properties.
• Controlling the interface properties of 2D materials is key to developing novel electronic devices.
• Fluorographane, a functionalized graphene derivative, presents opportunities for interface engineering.

Purpose of the Study:

• To investigate the structural and electronic properties of fluorographane/MoS2 interfaces.
• To explore the potential of fluorographane for tuning the electronic behavior of MoS2.
• To assess the feasibility of creating tunable Schottky barriers at these interfaces.

Main Methods:

• First principles calculations were employed to simulate the interfaces.
• Analysis of structural relaxations and electronic band structures was performed.
• The effect of functionalization and external electric fields was systematically studied.

Main Results:

• Unsymmetrical functionalization of graphene with H and F creates an intrinsic dipole moment.
• This dipole moment allows for switching MoS2 monolayer conductivity between n-type and p-type.
• Vanishing n-type/p-type Schottky barrier heights were achieved at MoS2-fluorographane contacts.
• Perpendicular electric fields enable tuning of Schottky barrier size and doping levels.

Conclusions:

• Fluorographane is a promising material for achieving bipolar doping of MoS2.
• The ability to tune electronic properties is vital for novel technological applications of 2D materials.
• These findings pave the way for advanced electronic devices based on 2D heterostructures.