Codoped germanene with 3p and 4p elements elements

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• The demand for advanced electronic materials drives research into two-dimensional (2D) materials like germanene.
• Heteroatom doping is a strategy to tune germanene's electronic properties, but achieving reproducible dopant arrangements is challenging.
• Codoping offers a potential solution to control dopant placement and understand their behavior in germanene.

Purpose of the Study:

• To investigate the dopant arrangement preferences in codoped germanene systems.
• To explore the electronic properties of germanene codoped with specific 3p and 4p elements.
• To assess the suitability of these codoped materials for electronic applications.

Main Methods:

• First-principles calculations were employed to study 21 codoped germanene systems.
• Calculations utilized M06-L and HSE06 methods with 6-31G* basis sets under periodic boundary conditions.
• B3LYP-D3 periodic calculations were also performed using CRYSTAL17 for comprehensive analysis.

Main Results:

• Specific codoped germanene systems, including AlP, AlS, GaP, GaS, GaAs, and GaSe, exhibit a tendency for dopants to occupy defined lattice positions.
• The 'ortho' disposition of dopants was found to be preferred in AlP, AlS, GaP, GaS, GaAs, and GaSe codoped germanene.
• These codoped materials display unique electronic properties suitable for developing new germanene-based electronic components.

Conclusions:

• Codoping provides a viable method to control dopant arrangement in germanene, overcoming challenges in single-dopant placement.
• The identified codoped germanene systems with preferred dopant arrangements show promise for next-generation electronic materials.
• Further research into these materials could accelerate the development of advanced electronic devices.