Advanced BCl₃-Driven Deep Ion Etching of β-Ga₂O₃ for Precision High-Aspect-Ratio Nanostructures

Area of Science:

• Materials Science
• Semiconductor Manufacturing
• Nanotechnology

Background:

• Gallium oxide (Ga₂O₃) devices are vital for industrial safety and harsh environment applications.
• Efficient deep etching processes for Ga₂O₃ are crucial but underexplored.
• Existing fabrication methods lack thorough investigation of key etching parameters.

Purpose of the Study:

• To investigate and develop an efficient deep etching technique for Ga₂O₃.
• To identify suitable dry-etching protocols for enhancing etching depth.
• To explore the chemical stability of different Ga₂O₃ planes during etching.

Main Methods:

• A dry-etching process, specifically deep ion-etching, was employed for Ga₂O₃.
• Focus was placed on optimizing parameters affecting etching rate, selectivity, and uniformity.
• Chemical stability of Ga₂O₃ planes was analyzed to guide process development.

Main Results:

• A deep ion-etching process for Ga₂O₃ was successfully established.
• Achieved a maximum etch depth of 6.97 µm in Ga₂O₃.
• Demonstrated the potential for creating high-aspect-ratio Ga₂O₃ nanostructures.

Conclusions:

• The developed deep etching technique significantly advances Ga₂O₃ fabrication.
• This enables the creation of robust Ga₂O₃ nanosensors for demanding environments.
• The findings open new avenues for Ga₂O₃-based device applications requiring deep etching.