Regularly patterned multi-section GaN nanorod arrays grown with a pulsed growth technique

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Gallium nitride (GaN) nanorods (NRs) are crucial for optoelectronic applications.
• Controlled synthesis of complex nanostructures is essential for advanced device functionalities.

Purpose of the Study:

• To demonstrate the growth of regularly patterned multi-section GaN nanorod arrays.
• To investigate the morphology evolution and optical properties of these structured nanorods.

Main Methods:

• Utilized pulsed metalorganic chemical vapor deposition (MOCVD).
• Controlled Ga supply duration to tune nanorod dimensions and create multi-section structures.
• Analyzed nanorod morphology using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Main Results:

• Successfully grew regularly patterned multi-section GaN NRs with varying cross-sectional sizes.
• Identified contrast line markers corresponding to Ga-rich layers, enabling tracing of morphology evolution.
• Demonstrated that multi-section GaN NRs with sidewall InGaN/GaN quantum wells exhibit significantly broader emission spectra compared to single-section NRs.

Conclusions:

• Pulsed MOCVD is an effective technique for fabricating complex, multi-section GaN nanorod architectures.
• The morphology of multi-section NRs is controllable via catalytic droplet size and facet coverage.
• Multi-section GaN NRs offer enhanced spectral properties for potential applications in light-emitting devices.