Polarization Engineered p-Type Electron Blocking Layer Free AlGaN Based UV-LED Using Quantum Barriers with...

Area of Science:

• Optoelectronics
• Semiconductor Devices
• Materials Science

Background:

• Electron leakage is a significant challenge in AlGaN ultra-violet (UV) light-emitting diodes (LEDs), limiting their performance.
• Conventional electron-blocking layers (EBLs) can introduce complexities and inefficiencies.
• Optimizing quantum barrier design is crucial for improving carrier confinement and device efficiency.

Purpose of the Study:

• To propose and investigate a novel electron-blocking layer (EBL)-free AlGaN UV LED structure.
• To enhance the optical and electrical characteristics of AlGaN UV LEDs by employing polarization-engineered heart-shaped AlGaN quantum barriers (QBs).
• To reduce electron leakage and non-radiative recombination in UV LED devices.

Main Methods:

• Utilized Silvaco Atlas TCAD tool (version 8.18.1.R) for device simulation.
• Employed parameters extracted from experimental data of conventional UV LEDs.
• Compared and optimized optical and electrical characteristics of three varying LED structures, focusing on the novel heart-shaped QB design.

Main Results:

• Achieved a 52.7% enhancement in electroluminescence at 275 nm.
• Recorded a 50.4% increase in optical output power.
• Observed a 61.3% improvement in overall efficiency for the proposed EBL-free AlGaN UV LED.
• Demonstrated decreased downward band bending and a flattened electrostatic field within the QBs.

Conclusions:

• The proposed EBL-free AlGaN UV LED with heart-shaped QBs offers a potential solution for high-efficiency UV emitters.
• Minimized non-radiative recombination and enhanced carrier confinement contribute to the observed performance improvements.
• The novel structure effectively addresses electron leakage issues, paving the way for advanced UV LED technology.