Optoelectronic performance and modulation bandwidth of green µ-LEDs using AlON buffer layer.

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Green micro-light-emitting diodes (µ-LEDs) are crucial for next-generation displays and visible light communication.
• Traditional Aluminum Nitride (AlN) buffer layers face limitations in optimizing µ-LED performance.
• Internal stress and the quantum-confined Stark effect (QCSE) hinder device efficiency and speed.

Purpose of the Study:

• To investigate the efficacy of an Aluminum Oxynitride (AlON) buffer layer in enhancing green µ-LEDs.
• To compare the performance of AlON buffer layers against traditional AlN buffer layers.
• To assess the impact of AlON on crystal quality, internal stress, and optoelectronic properties.

Main Methods:

• Fabrication of green µ-LEDs utilizing AlON buffer layers.
• Comparative analysis with µ-LEDs employing AlN buffer layers.
• Characterization of GaN crystal quality, internal stress, and optoelectronic performance metrics.

Main Results:

• AlON buffer layers significantly improve Gallium Nitride (GaN) crystal quality compared to AlN.
• Reduced internal stress and suppression of the quantum-confined Stark effect (QCSE) were observed with AlON.
• A 21.75% enhancement in modulation bandwidth and a 9.86% increase in peak external quantum efficiency were achieved.

Conclusions:

• AlON buffer layers offer a superior alternative to AlN for high-performance green µ-LEDs.
• The enhanced optoelectronic properties position AlON as a key material for advanced display and communication technologies.
• Further research into AlON buffer layers can unlock new possibilities for efficient and high-speed optoelectronic devices.