Wafer Scale Gallium Nitride Integrated Electrode Toward Robust High Temperature Energy Storage

Area of Science:

• Materials Science
• Electrochemistry
• Semiconductor Physics

Background:

• Gallium Nitride (GaN) is a wide bandgap semiconductor with high structural stability and electron mobility, suitable for high-temperature applications.
• Existing wafer-scale GaN single-crystal integrated electrodes for energy storage are limited.
• There is a need for advanced electrode materials for high-performance energy storage devices operating under extreme conditions.

Purpose of the Study:

• To develop wafer-scale Gallium Nitride (GaN) nanochannels with a gallium oxynitride (GaON) layer for energy storage applications.
• To investigate the effect of Si-doping on GaN nanochannel formation and electronic properties.
• To evaluate the electrochemical performance of GaN-based supercapacitors at elevated temperatures.

Main Methods:

• Fabrication of Si-doped GaN nanochannels with a GaON layer on a centimeter scale.
• Characterization of the nanochannel structure and electronic properties.
• Assembly and electrochemical testing of GaN-based supercapacitors at 140°C.

Main Results:

• Si-doping modulated electronic redistribution, improving conductivity and driving nanochannel formation.
• The GaN nanochannels with GaON layer exhibited adequate active sites and structural stability.
• GaN-based supercapacitors demonstrated outstanding charge storage capabilities at 140°C, retaining 90% capacity after 50,000 cycles.

Conclusions:

• Wafer-scale GaN single-crystal integrated electrodes can be achieved using Si-doped GaN nanochannels.
• These electrodes offer excellent performance and durability for high-temperature energy storage.
• This work paves the way for self-powered, integrated (opto)-electronic devices.