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Title: Improvement of carrier injection symmetry and quantum efficiency in InGaN light-emitting diodes with Mg delta-doped barriers

Abstract

The effect of δ-doping of In{sub 0.06}Ga{sub 0.94}N barriers with Mg on the quantum efficiency of blue light-emitting-diodes (LEDs) with active regions composed of 6 (hex) 3-nm In{sub 0.15}Ga{sub 0.85}N is investigated. Compared to the reference sample, δ-doping of the first barrier on the n-side of the LED structure improves the peak external quantum efficiency (EQE) by 20%, owing to the increased hole concentration in the wells adjacent to the n-side, as confirmed by numerical simulations of carrier distributions across the active region. Doping the second barrier, in addition to the first one, did not further enhance the EQE, which likely indicates compensation of improved hole injection by degradation of the active region quality due to Mg doping. Both LEDs with Mg δ-doped barriers effectively suppress the drop of efficiency at high injection when compared to the reference sample, and the onset of EQE peak roll-off shifts from ∼80 A/cm{sup 2} in the reference LED to ∼120 A/cm{sup 2} in the LEDs with Mg δ-doped barriers.

Authors:
; ; ; ; ; ;  [1]
  1. Department of Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, Virginia 23284 (United States)
Publication Date:
OSTI Identifier:
22398988
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; DOPED MATERIALS; GALLIUM NITRIDES; HOLES; INDIUM COMPOUNDS; LIGHT EMITTING DIODES; MAGNESIUM; QUANTUM EFFICIENCY; SYMMETRY

Citation Formats

Zhang, F., Can, N., Hafiz, S., Monavarian, M., Das, S., Avrutin, V., Özgür, Ü., E-mail: uozgur@vcu.edu, and Morkoç, H. Improvement of carrier injection symmetry and quantum efficiency in InGaN light-emitting diodes with Mg delta-doped barriers. United States: N. p., 2015. Web. doi:10.1063/1.4919917.
Zhang, F., Can, N., Hafiz, S., Monavarian, M., Das, S., Avrutin, V., Özgür, Ü., E-mail: uozgur@vcu.edu, & Morkoç, H. Improvement of carrier injection symmetry and quantum efficiency in InGaN light-emitting diodes with Mg delta-doped barriers. United States. https://doi.org/10.1063/1.4919917
Zhang, F., Can, N., Hafiz, S., Monavarian, M., Das, S., Avrutin, V., Özgür, Ü., E-mail: uozgur@vcu.edu, and Morkoç, H. 2015. "Improvement of carrier injection symmetry and quantum efficiency in InGaN light-emitting diodes with Mg delta-doped barriers". United States. https://doi.org/10.1063/1.4919917.
@article{osti_22398988,
title = {Improvement of carrier injection symmetry and quantum efficiency in InGaN light-emitting diodes with Mg delta-doped barriers},
author = {Zhang, F. and Can, N. and Hafiz, S. and Monavarian, M. and Das, S. and Avrutin, V. and Özgür, Ü., E-mail: uozgur@vcu.edu and Morkoç, H.},
abstractNote = {The effect of δ-doping of In{sub 0.06}Ga{sub 0.94}N barriers with Mg on the quantum efficiency of blue light-emitting-diodes (LEDs) with active regions composed of 6 (hex) 3-nm In{sub 0.15}Ga{sub 0.85}N is investigated. Compared to the reference sample, δ-doping of the first barrier on the n-side of the LED structure improves the peak external quantum efficiency (EQE) by 20%, owing to the increased hole concentration in the wells adjacent to the n-side, as confirmed by numerical simulations of carrier distributions across the active region. Doping the second barrier, in addition to the first one, did not further enhance the EQE, which likely indicates compensation of improved hole injection by degradation of the active region quality due to Mg doping. Both LEDs with Mg δ-doped barriers effectively suppress the drop of efficiency at high injection when compared to the reference sample, and the onset of EQE peak roll-off shifts from ∼80 A/cm{sup 2} in the reference LED to ∼120 A/cm{sup 2} in the LEDs with Mg δ-doped barriers.},
doi = {10.1063/1.4919917},
url = {https://www.osti.gov/biblio/22398988}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 18,
volume = 106,
place = {United States},
year = {Mon May 04 00:00:00 EDT 2015},
month = {Mon May 04 00:00:00 EDT 2015}
}