AlN/h-BN Heterostructures for Mg Dopant-Free Deep Ultraviolet Photonics

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Aluminum-rich aluminum gallium nitride (AlGaN) is crucial for deep-ultraviolet (DUV) light sources.
• High-efficiency UV-C LEDs (200-280 nm) are limited by poor p-type conduction in AlGaN and lack of transparent electrodes.

Purpose of the Study:

• To address challenges in DUV LED efficiency by developing Mg dopant-free Al(Ga)N/h-BN nanowire heterostructures.
• To demonstrate a novel approach for achieving efficient DUV light emission.

Main Methods:

• Utilized acceptor-like boron vacancy formation in hexagonal boron nitride (h-BN).
• Fabricated Al(Ga)N/h-BN nanowire heterostructures.
• Investigated Mg-free III-nitride LEDs.

Main Results:

• Demonstrated h-BN as a highly conductive, DUV-transparent electrode with hole concentration ~10^20 cm^-3.
• Achieved the first Al(Ga)N/h-BN LED with strong emission at ~210 nm.
• Reported the first Mg-free III-nitride LEDs with high electrical efficiency (80% at 20 A/cm^2).

Conclusions:

• Mg dopant-free Al(Ga)N/h-BN nanowire heterostructures effectively overcome critical challenges in DUV LED development.
• This breakthrough enables efficient and transparent electrodes for DUV light sources.
• Paves the way for next-generation, high-efficiency deep-ultraviolet solid-state lighting.