skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes

Abstract

Electrical current transport through leakage paths in AlGaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) and their effect on LED performance are investigated. Open-core threading dislocations, or nanopipes, are found to conduct current through nominally insulating Al{sub 0.7}Ga{sub 0.3}N layers and limit the performance of DUV-LEDs. A defect-sensitive phosphoric acid etch reveals these open-core threading dislocations in the form of large, micron-scale hexagonal etch pits visible with optical microscopy, while closed-core screw-, edge-, and mixed-type threading dislocations are represented by smaller and more numerous nanometer-scale pits visible by atomic-force microscopy. The electrical and optical performances of DUV-LEDs fabricated on similar Si-doped Al{sub 0.7}Ga{sub 0.3}N templates are found to have a strong correlation to the density of these nanopipes, despite their small fraction (<0.1% in this study) of the total density of threading dislocations.

Authors:
; ; ; ; ;  [1]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
22314532
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC FORCE MICROSCOPY; DENSITY; DISLOCATIONS; DOPED MATERIALS; ELECTRIC CURRENTS; LEAKS; LIGHT EMITTING DIODES; OPTICAL MICROSCOPY; PERFORMANCE; PHOSPHORIC ACID; SPECTROSCOPY; ULTRAVIOLET RADIATION

Citation Formats

Moseley, Michael, E-mail: mwmosel@sandia.gov, Allerman, Andrew, Crawford, Mary, Wierer, Jonathan J., Smith, Michael, and Biedermann, Laura. Electrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes. United States: N. p., 2014. Web. doi:10.1063/1.4891830.
Moseley, Michael, E-mail: mwmosel@sandia.gov, Allerman, Andrew, Crawford, Mary, Wierer, Jonathan J., Smith, Michael, & Biedermann, Laura. Electrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes. United States. doi:10.1063/1.4891830.
Moseley, Michael, E-mail: mwmosel@sandia.gov, Allerman, Andrew, Crawford, Mary, Wierer, Jonathan J., Smith, Michael, and Biedermann, Laura. Thu . "Electrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes". United States. doi:10.1063/1.4891830.
@article{osti_22314532,
title = {Electrical current leakage and open-core threading dislocations in AlGaN-based deep ultraviolet light-emitting diodes},
author = {Moseley, Michael, E-mail: mwmosel@sandia.gov and Allerman, Andrew and Crawford, Mary and Wierer, Jonathan J. and Smith, Michael and Biedermann, Laura},
abstractNote = {Electrical current transport through leakage paths in AlGaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) and their effect on LED performance are investigated. Open-core threading dislocations, or nanopipes, are found to conduct current through nominally insulating Al{sub 0.7}Ga{sub 0.3}N layers and limit the performance of DUV-LEDs. A defect-sensitive phosphoric acid etch reveals these open-core threading dislocations in the form of large, micron-scale hexagonal etch pits visible with optical microscopy, while closed-core screw-, edge-, and mixed-type threading dislocations are represented by smaller and more numerous nanometer-scale pits visible by atomic-force microscopy. The electrical and optical performances of DUV-LEDs fabricated on similar Si-doped Al{sub 0.7}Ga{sub 0.3}N templates are found to have a strong correlation to the density of these nanopipes, despite their small fraction (<0.1% in this study) of the total density of threading dislocations.},
doi = {10.1063/1.4891830},
journal = {Journal of Applied Physics},
number = 5,
volume = 116,
place = {United States},
year = {Thu Aug 07 00:00:00 EDT 2014},
month = {Thu Aug 07 00:00:00 EDT 2014}
}