Novel two-dimensional silicon-carbon binaries by crystal structure prediction

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Graphene and silicene exhibit semimetallic bandstructures, limiting their application in electronic devices.
• Developing semiconducting materials compatible with silicon-based electronics is crucial for next-generation devices.

Purpose of the Study:

• To theoretically investigate the phase diagram of two-dimensional (2D) silicon-carbon binaries.
• To explore novel 2D silicon-carbon structures and their electronic properties.

Main Methods:

• Utilizing ab initio global structural prediction methods.
• Employing exhaustive enumeration of 2D structure prototypes across the composition range.

Main Results:

• Discovery of diverse low-energy 2D silicon-carbon structures, including honeycomb, dumbbell, and bridged nanosheets.
• Identification of non-planar structures and 3D networks with mixed sp2 and sp3 bonding.
• Characterization of a wide range of electronic properties in these novel phases.

Conclusions:

• Two-dimensional silicon-carbon alloys present a rich landscape of materials with tunable electronic properties.
• These materials hold potential for the development of high-performance nanoscale electronic devices.