Breakdown-induced conductive channel for III-nitride light-emitting devices

Area of Science:

• Solid-state lighting
• Semiconductor devices
• Optoelectronics

Background:

• III-nitride semiconductor-based light-emitting diodes (LEDs) offer high thermal stability and brightness for solid-state lighting.
• Commercialization of Gallium Nitride (GaN)-based LEDs necessitates improved reliability due to electrostatic discharge, reverse leakage, and breakdown concerns.
• Research on the reverse bias characteristics of GaN-based LEDs remains limited.

Purpose of the Study:

• To investigate the reverse breakdown mechanism in GaN-based LEDs.
• To explore novel LED structures and applications based on reverse bias characteristics.

Main Methods:

• Studied the reverse breakdown mechanism of GaN-based LEDs.
• Demonstrated the formation of a conductive channel via local breakdown.
• Developed a novel planar-type LED structure without an n-contact electrode.

Main Results:

• A local breakdown in GaN-based LEDs can form a conductive channel.
• This phenomenon allows for a novel planar-type LED structure lacking an n-contact electrode.
• The approach is applicable to AC-controllable light-emitting devices, eliminating the need for AC-DC converters.

Conclusions:

• Understanding reverse breakdown is crucial for GaN-based LED reliability.
• A novel planar-type LED structure can be realized by exploiting local breakdown mechanisms.
• This research opens possibilities for efficient AC-controllable lighting solutions.