A comparative study of interfacial thermal conductance between metal and semiconductor

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Controlling interfacial thermal conductance is critical for thermal management in nano- and micro-electronic devices.
• Understanding metal-semiconductor interfaces is key to designing efficient electronic components.

Purpose of the Study:

• To investigate and control the thermal conductance at metal-semiconductor interfaces.
• To analyze interfacial alignments and electronic characteristics influencing thermal transport.

Main Methods:

• Utilized first-principles calculations based on hybrid density functional theory.
• Employed diffuse mismatch model, acoustic mismatch model, and nonequilibrium molecular dynamics for analysis.
• Calculated thermal conductance at C-Cu and Si-Cu interfaces.

Main Results:

• Nonequilibrium molecular dynamics yielded thermal conductance values of 32.55 MW m⁻² K⁻¹ (C-Cu) and 341.87 MW m⁻² K⁻¹ (Si-Cu).
• Theoretical results align with experimental data, indicating phonon-phonon interactions dominate heat transport over electron-phonon interactions.
• Strong interfacial scattering suppresses thermal conductance in weaker coupling heterostructures.

Conclusions:

• Enhancing interface coupling strength is an effective strategy to improve interfacial thermal conductance.
• Findings offer valuable insights for Schottky diode design and thermal management at metal-semiconductor interfaces.