Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

UV LEDs Based on p-i-n Core-Shell AlGaN/GaN Nanowire Heterostructures Grown by N-polar Selective Area Epitaxy

Published

Author(s)

Matthew D. Brubaker, Kristen L. Genter, Alexana Roshko, Paul T. Blanchard, Bryan T. Spann, Todd E. Harvey, Kristine A. Bertness

Abstract

Ultraviolet light-emitting diodes (UV LEDs) fabricated from N-polar AlGaN/GaN core-shell nanowires with p-i-n structure produced electroluminescence at 365 nm with ~5x higher intensities than similar GaN homojunction LEDs. The improved characteristics were attributed to localization of spontaneous recombination to the nanowire core, reduction of carrier overflow losses through the nanowire shell, and elimination of current shunting. Poisson-drift-diffusion modeling indicated that a shell Al mole fraction of x=0.1 in AlxGa1-xN effectively confines electrons and injected holes to the GaN core region. AlGaN overcoat layers targeting this approximate Al mole fraction were found to possess a low-Al-content tip and high-Al-content shell, as determined by scanning transmission electron microscopy. Photoluminescence spectroscopy further revealed the actual Al mole fraction to be nanowire diameter dependent, where the tip and shell compositions converged towards the nominal flux ratio for large- diameter nanowires.
Citation
Nanotechnology

Keywords

GaN, Nanowires, LEDs, Core-shell, Selective Area Epitaxy

Citation

Brubaker, M. , Genter, K. , Roshko, A. , Blanchard, P. , Spann, B. , Harvey, T. and Bertness, K. (2019), UV LEDs Based on p-i-n Core-Shell AlGaN/GaN Nanowire Heterostructures Grown by N-polar Selective Area Epitaxy, Nanotechnology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927132 (Accessed January 28, 2023)
Created March 20, 2019, Updated July 6, 2020