Physical-Based Simulation of the GaN-Based Grooved-Anode Planar Gunn Diode

Area of Science:

• Solid-state physics
• Materials science
• Electrical engineering

Background:

• Gunn diodes are crucial for high-frequency oscillations.
• Enhancing output characteristics of Gunn diodes remains a key research area.
• Gallium nitride (GaN) offers superior material properties for high-power and high-frequency devices.

Purpose of the Study:

• To propose and analyze a novel GaN-based heterostructure Gunn diode with a grooved anode.
• To investigate the impact of anode geometry on Gunn oscillation waveforms.
• To optimize the device structure for enhanced output power and frequency.

Main Methods:

• Numerical simulations were employed to model the device performance.
• A grooved anode contact was designed to divide the diode into parallel short-channel sections.
• Device parameters, including groove position and dimensions, were systematically varied.

Main Results:

• The grooved anode design effectively separates the device into two parallel short-channel diodes.
• Positioning the groove centrally nearly doubles output power and frequency compared to single-channel devices.
• Optimal performance was achieved with a 2.0-µm symmetrical grooved-anode diode, yielding 5.48 mW power at 172.81 GHz with 3.13% efficiency.
• Off-center groove placement enhances harmonic frequencies.

Conclusions:

• The proposed GaN heterostructure grooved-anode Gunn diode is a promising solid-state source for terahertz oscillators.
• The grooved anode contact offers a viable method for significantly boosting Gunn diode performance.
• This design opens avenues for developing more efficient and powerful terahertz sources.