Enhanced contact performance of high-brightness micro-LEDs via ITO/Al anode stack and annealing process
Zeyang Meng1, Chaoyu Lu2, Guanghua Wang3,4,5
1School of Materials and Energy, Yunnan University, Kunming, 650091, China.
Scientific Reports
|May 27, 2024
Summary
Optimizing anode contact in micro-light-emitting diodes (Micro-LEDs) using gallium nitride (GaN) is crucial. Annealing a specific electrode structure at 500°C for 5 min significantly boosts Micro-LED performance, achieving high brightness and efficiency.
Area of Science:
- Solid-state lighting and displays
- Semiconductor device physics
- Materials science of optoelectronics
Background:
- Micro-light-emitting diodes (Micro-LEDs) offer high luminous efficiency, brightness, and reliability.
- Achieving optimal performance in Micro-LEDs hinges on effective anode contact with P-GaN layers.
Purpose of the Study:
- To investigate the influence of electrode structure design on Micro-LED anode contact.
- To determine optimized annealing conditions for enhanced device performance.
Main Methods:
- Fabrication of a 9.1 μm Micro-LED device with a specific ITO/Ti/Al/Ni/Cr/Pt/Au electrode structure.
- Optimization of annealing parameters, including temperature (500°C), duration (5 min), and atmosphere (Ar gas).
Main Results:
- The optimized Micro-LED device demonstrated significantly improved anode contact performance.
- Achieved a current of 10.9 mA and a brightness of 298,628 cd/m² at 5 V.
- The optimized device reached a peak External Quantum Efficiency (EQE) of 10.06% at 400 mA.
Conclusions:
- The study successfully optimized the anode contact structure and annealing process for GaN-based Micro-LEDs.
- The findings provide a pathway for enhancing the performance and reliability of next-generation display technologies.
