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Si/Ge interfacial thermal conductance enhancement through Sn nanoparticle embedding
Ying-Guang Liu1, Heng-Xuan Li1, Yu-Jun Qiu1
1Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding 071003, Hebei, China. yingguang266@126.com.
Physical Chemistry Chemical Physics : PCCP
|October 20, 2023
Summary
Embedding tin nanoparticles at the silicon/germanium interface significantly enhances interfacial thermal conductance (ITC). Optimal nanoparticle size and number boost ITC by 1.95 times through improved inelastic phonon scattering.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Effective thermal management is critical for nanodevices.
- Interfacial thermal conductance (ITC) plays a key role in heat dissipation at material interfaces.
Purpose of the Study:
- To investigate the impact of embedded tin (Sn) nanoparticles on the ITC of silicon/germanium (Si/Ge) interfaces.
- To understand the mechanisms behind ITC enhancement or reduction due to Sn nanoparticles.
Main Methods:
- Non-equilibrium molecular dynamics (NEMD) simulations were employed.
- Analysis included phonon transmission functions and density of states.
- Sensitivity analysis was performed on nanoparticle parameters.
Main Results:
- ITC was enhanced by up to 1.95 times with optimized Sn nanoparticle concentration and diameter.
- Enhanced inelastic phonon scattering, facilitated by Sn nanoparticles, was identified as the primary mechanism for ITC improvement.
- Exceeding optimal nanoparticle density led to a decrease in ITC due to dominant elastic phonon scattering.
- ITC showed higher sensitivity to nanoparticle diameter than number.
- Increasing temperature enhanced phonon excitation and inelastic scattering, further boosting ITC.
Conclusions:
- Embedding Sn nanoparticles offers a viable strategy for enhancing ITC at Si/Ge interfaces.
- The study deepens the understanding of elastic and inelastic phonon transport mechanisms at interfaces.
- Control over nanoparticle characteristics is crucial for optimizing interfacial thermal transport.
