Realization of a p-n junction in a single layer boron-phosphide

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials are crucial for next-generation nanoelectronic and optoelectronic devices.
• Single-layer boron phosphide (h-BP) is a promising 2D material with potential applications.

Purpose of the Study:

• Investigate the electronic and mechanical properties of single-layer boron phosphide (h-BP).
• Explore the electron transport properties of an h-BP-based p-n junction.
• Analyze the effects of doping on h-BP's electronic and transport characteristics.

Main Methods:

• First-principles calculations based on density functional theory (DFT).
• Non-equilibrium Green's function (NEGF) formalism for electron transport.
• Substitutional doping of h-BP with Carbon (C) for n-type and Silicon (Si) for p-type.

Main Results:

• h-BP is mechanically stable with a direct band gap of 0.9 eV at the K-point.
• Substitutional doping with C and Si creates effective donor and acceptor states, respectively.
• The engineered h-BP p-n junction shows diode characteristics with significant current rectification and negative differential resistance (NDR).

Conclusions:

• Single-layer boron phosphide is a viable 2D material for electronic and optoelectronic applications.
• The h-BP p-n junction's properties, including NDR, can be tuned through device engineering and doping concentration.
• This study highlights the potential of h-BP for advanced functional electronic devices.