High-Performance AlGaN Double Channel HEMTs with Improved Drain Current Density and High Breakdown Voltage

Area of Science:

• Materials Science
• Condensed Matter Physics
• Semiconductor Device Physics

Background:

• AlGaN-based heterostructures are crucial for high-frequency and high-power electronic devices.
• Optimizing carrier transport properties in these materials is essential for device performance.

Purpose of the Study:

• To propose and investigate AlGaN double channel heterostructures for high-performance HEMTs.
• To enhance the transport properties, specifically carrier density and mobility, in AlGaN channel devices.

Main Methods:

• Growth of AlGaN double channel heterostructures using metal organic chemical vapor deposition (MOCVD).
• Fabrication and characterization of AlGaN double channel high electron mobility transistors (HEMTs).

Main Results:

• The double channel design significantly improves 2D electron gas (2DEG) density and carrier confinement.
• Reduced carrier-carrier scattering in individual channels leads to elevated electron mobility.
• Achieved a maximum drain current density (Imax) of 473 mA/mm at 0 V gate voltage.
• Demonstrated superior breakdown performance compared to single-channel devices.

Conclusions:

• AlGaN double channel HEMTs exhibit excellent transport properties and breakdown characteristics.
• The proposed double channel structure offers a promising pathway for advanced microwave power electronics.
• This work provides new insights for the development of group III nitride-based electronic devices.