MOCVD Growth and Characterization of Be-Doped GaN

Area of Science:

• Materials Science
• Semiconductor Physics
• Gallium Nitride Research

Background:

• Beryllium (Be) is a potential p-type dopant for gallium nitride (GaN), an alternative to magnesium (Mg).
• Previous attempts to create conductive p-GaN:Be have been unsuccessful due to deep Be defects and compensating defects, resulting in n-type or semi-insulating material.
• Most prior studies utilized molecular beam epitaxy or ion implantation, with limited reports on MOCVD due to the toxicity of Be organometallics.

Purpose of the Study:

• To systematically investigate the growth of beryllium-doped gallium nitride (GaN:Be) using metal-organic chemical vapor deposition (MOCVD).
• To explore new Be incorporation pathways enabled by MOCVD for achieving p-type conductivity in GaN.
• To establish growth conditions for high-quality GaN with stable Be incorporation.

Main Methods:

• Metal-organic chemical vapor deposition (MOCVD) was employed for the systematic doping of GaN with beryllium.
• Growth conditions were optimized to achieve high-quality GaN material with stable Be incorporation.
• Photoluminescence studies were used to analyze the optical properties of the doped GaN samples.

Main Results:

• All MOCVD-grown GaN:Be samples exhibited the characteristic UV band and yellow luminescence signature.
• Stable beryllium incorporation into GaN was achieved under optimized growth conditions.
• The MOCVD technique facilitated Be incorporation pathways not accessible with previous methods.

Conclusions:

• Metal-organic chemical vapor deposition (MOCVD) offers a viable route for doping gallium nitride (GaN) with beryllium (Be).
• This approach demonstrates significant potential for overcoming previous challenges and achieving conductive p-type GaN:Be.
• Further research using MOCVD is highly promising for advancing GaN:Be material properties.