Self-Templated Sputtering Synthesis of III-Nitride Nanowire Array for Solar Water Splitting.

Area of Science:

• Materials Science
• Nanotechnology
• Renewable Energy

Background:

• III-nitride materials are promising for solar water splitting and green hydrogen production.
• Conventional growth methods like MBE and MOCVD are expensive for large-scale manufacturing.

Purpose of the Study:

• To develop a cost-effective method for fabricating Mg-doped InGaN nanowires using magnetron sputtering epitaxy (MSE).
• To evaluate the solar-to-hydrogen (STH) efficiency and stability of the fabricated nanowires for sustainable hydrogen production.

Main Methods:

• Fabrication of Mg-doped InGaN nanowires (Mg/MSE-InGaN NWs) using magnetron sputtering epitaxy (MSE).
• Utilizing a self-templated growth pattern and selective chemical etching (KOH and HNO3) to expose nanowires.
• Optimizing a five-step workflow: sputtering, base etching, acid cleaning, magnesium doping, and annealing.

Main Results:

• Achieved a solar-to-hydrogen (STH) efficiency of 0.47% with 120 hours of stability.
• Demonstrated significant improvement from an initial 0.03% efficiency using sputter deposition.
• The optimized workflow enhanced the performance of Mg/MSE-InGaN NWs for photocatalytic applications.

Conclusions:

• Magnetron sputtering epitaxy (MSE) offers a scalable and economical alternative to MBE for III-nitride fabrication.
• This approach enables the large-scale manufacturing of III-nitride photocatalytic devices for sustainable hydrogen production.
• The developed Mg/MSE-InGaN NWs show potential for efficient and stable green hydrogen generation.