The ESD Robustness and Protection Technology of P-GaN HEMT

Area of Science:

• Materials Science
• Electrical Engineering
• Semiconductor Physics

Background:

• P-GaN HEMTs are crucial for power electronics.
• Understanding Electrostatic Discharge (ESD) failure mechanisms is vital for device reliability.
• Existing ESD protection strategies for P-GaN HEMTs have limitations.

Purpose of the Study:

• Analyze ESD failure modes in P-GaN HEMTs with different gate structures.
• Review and compare unidirectional ESD protection technologies.
• Evaluate bidirectional ESD protection technologies for P-GaN HEMTs.

Main Methods:

• Failure analysis of Schottky and Ohmic gate P-GaN HEMTs under ESD stress.
• Systematic review of three unidirectional ESD protection schemes.
• Evaluation of four bidirectional ESD protection schemes.

Main Results:

• Schottky gate P-GaN HEMTs exhibit breakdown failure due to charge accumulation and overvoltage.
• Unidirectional ESD protection has low reverse triggering voltage and leakage currents.
• Bidirectional ESD protection provides superior reverse voltage clamping but also suffers from leakage currents.

Conclusions:

• Gate structure significantly impacts P-GaN HEMT ESD robustness.
• Bidirectional ESD protection is more effective for reverse ESD events than unidirectional.
• Further research is needed to mitigate leakage currents in GaN ESD protection circuits.