Multi-channel thermal transport mechanisms in high-power GaN-Based micro/nano-devices

Area of Science:

• Materials Science
• Solid State Physics
• Thermal Engineering

Background:

• High-power Gallium Nitride (GaN) systems require advanced thermal management due to their critical role in next-generation electronics.
• Complex heat dissipation processes in GaN under high-power operation necessitate a deeper understanding of underlying thermal transport mechanisms.

Purpose of the Study:

• To review recent experimental and theoretical advancements in multi-channel thermal transport within high-power GaN-based systems.
• To emphasize the interplay between heat generation, carrier dynamics, interfacial transport, and size effects in GaN thermal management.

Main Methods:

• Review of experimental data and theoretical models concerning thermal transport in GaN.
• Analysis of multi-channel heat dissipation pathways, including hot electron/phonon dynamics and surface phonon polaritons.
• Investigation of factors influencing thermal transport, such as temperature, defects, and interfaces.

Main Results:

• Detailed examination of coupled thermal transport phenomena in GaN, including non-equilibrium heat generation and hot carrier dynamics.
• Highlighting the significance of interfacial thermal transport and size-dependent phonon behavior in micro/nano-scale GaN devices.
• Discussion on the modulation of thermal transport by temperature, structural defects, and interface characteristics.

Conclusions:

• A comprehensive understanding of micro/nano-scale thermal transport in GaN is achieved through a multi-channel perspective.
• Physical insights are provided for developing advanced heat dissipation strategies in high-power GaN electronics.
• Identified research gaps and proposed future directions for GaN thermal management research.