Light-Emitting Diodes Based on InGaN/GaN Nanowires on Microsphere-Lithography-Patterned Si Substrates

Area of Science:

• Materials Science
• Semiconductor Physics
• Optoelectronics

Background:

• Integrating diverse semiconductor materials on silicon is crucial for advanced electronic devices.
• Nanowires offer a unique geometry for overcoming lattice mismatch challenges in epitaxial growth.
• Silicon substrates are desirable for large-scale, cost-effective optoelectronic device fabrication.

Purpose of the Study:

• To demonstrate the selective-area synthesis of ordered nanowire arrays on silicon substrates.
• To fabricate and characterize heterostructured nanowire-based light-emitting diodes (LEDs).
• To explore the potential of these LEDs for multicolor or white light applications.

Main Methods:

• Utilized molecular beam epitaxy for growing n-GaN/i-InGaN/p-GaN heterostructured nanowires and tripods.
• Employed microsphere optical lithography for prepatterning Si/SiO2 substrates.
• Investigated the electrical and optical properties of the fabricated nanowire LEDs.

Main Results:

• Achieved selective-area synthesis of regular nanowire arrays on large-area silicon.
• Demonstrated rectifying behavior at the n-GaN nanowire/n-Si interface.
• Observed electroluminescence in the broad spectral range with a peak near 500 nm.

Conclusions:

• The presented method enables efficient fabrication of nanowire optoelectronic devices on silicon.
• The developed n-GaN/i-InGaN/p-GaN nanowire LEDs show potential for multicolor or white light displays.
• This approach facilitates the integration of III-V and III-N materials on silicon for next-generation optoelectronics.