Flexible thermal interface based on self-assembled boron arsenide for high-performance thermal management

Area of Science:

• Materials Science
• Nanotechnology
• Thermal Engineering

Background:

• Effective thermal management is crucial for modern electronics, driving innovation in thermal interface materials (TIMs).
• Current TIMs face limitations in balancing high thermal conductivity with mechanical flexibility for advanced applications.

Purpose of the Study:

• To report a novel, high-performance thermal interface material based on self-assembled cubic boron arsenide (s-BAs).
• To demonstrate the material's potential for efficient heat dissipation and flexible thermal cooling applications.

Main Methods:

• Self-assembled manufacturing of cubic boron arsenide (BAs) microcrystals within a polymer composite.
• Characterization of thermal conductivity, elastic compliance, and mechanical flexibility (bending cycles).
• Device integration with power LEDs to evaluate cooling performance.

Main Results:

• Achieved a record-high thermal conductivity of 21 W/m·K for the s-BAs material.
• Exhibited excellent elastic compliance (down to 100 kPa) and maintained high conductivity over 500 bending cycles.
• Demonstrated a superior cooling performance, reducing hot spot temperature by up to 45°C in power LED devices.

Conclusions:

• Scalable manufacturing of a new generation of energy-efficient and flexible thermal interface materials is achieved.
• The developed s-BAs material shows significant promise for advanced thermal management in integrated circuits, wearable electronics, and soft robotics.