High-Performance GaN/BAs Heterojunctions: Dual Functionality of BAs for Enhanced Electrical and Thermal Management in...

Area of Science:

• Materials Science
• Semiconductor Physics

Background:

• Cubic boron arsenide (BAs) exhibits exceptional thermal and electrical properties, making it attractive for advanced electronic and optoelectronic devices.
• Challenges in BAs growth conditions hinder its integration into functional devices.

Purpose of the Study:

• To fabricate high-quality gallium nitride/BAs (GaN/BAs) heterojunctions.
• To evaluate the electrical and thermal performance of these heterojunctions.
• To explore the potential of BAs in next-generation power electronics.

Main Methods:

• Fabrication of GaN/BAs heterojunctions using surface-activated bonding.
• Atomic characterization to analyze interface quality and layer thickness.
• Performance testing of rectification ratio and thermal dissipation.

Main Results:

• Achieved high-quality GaN/BAs interfaces with a rectification ratio exceeding 10⁷.
• Optimal performance observed at intermediate layer thicknesses below 20 nm.
• BAs demonstrated superior heat dissipation compared to GaN alone.

Conclusions:

• Surface-activated bonding enables high-quality GaN/BAs heterojunctions.
• BAs serves as both an active p-type semiconductor and an efficient cooling substrate.
• BAs integration is promising for advanced power electronics requiring excellent electrical and thermal management.