Effect of composition-graded interlayers in double-heterostructure blue InGaN light-emitting diodes

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Abstract

The optical and electrical characteristics of the double-heterostructure (DH) blue InGaN light-emitting diodes (LEDs) with composition-graded interlayers are studied numerically. Specifically, the detailed physical mechanisms and influences of grading layer thickness on the LED performance are explored systematically. Simulation results reveal that besides the advantages of mitigating lattice relaxation in real epitaxy, the employment of thick composition-graded interlayers can benefit from the enhanced spatial separation of electron-hole wavefunctions, suppressed Auger recombination, and reduced polarization effect in DH active region. The illumination efficiency and electrical characteristics are markedly improved when the thick grading layers are employed.

Original languageEnglish
Pages (from-to)154-157
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume213
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1

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Light emitting diodes
Heterojunctions
interlayers
light emitting diodes
Wave functions
Chemical analysis
Epitaxial growth
Crystal lattices
epitaxy
Lighting
illumination
Polarization
Electrons
polarization
simulation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

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abstract = "The optical and electrical characteristics of the double-heterostructure (DH) blue InGaN light-emitting diodes (LEDs) with composition-graded interlayers are studied numerically. Specifically, the detailed physical mechanisms and influences of grading layer thickness on the LED performance are explored systematically. Simulation results reveal that besides the advantages of mitigating lattice relaxation in real epitaxy, the employment of thick composition-graded interlayers can benefit from the enhanced spatial separation of electron-hole wavefunctions, suppressed Auger recombination, and reduced polarization effect in DH active region. The illumination efficiency and electrical characteristics are markedly improved when the thick grading layers are employed.",
author = "Yen-Kuang Kuo and Jih-Yuan Chang",
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AB - The optical and electrical characteristics of the double-heterostructure (DH) blue InGaN light-emitting diodes (LEDs) with composition-graded interlayers are studied numerically. Specifically, the detailed physical mechanisms and influences of grading layer thickness on the LED performance are explored systematically. Simulation results reveal that besides the advantages of mitigating lattice relaxation in real epitaxy, the employment of thick composition-graded interlayers can benefit from the enhanced spatial separation of electron-hole wavefunctions, suppressed Auger recombination, and reduced polarization effect in DH active region. The illumination efficiency and electrical characteristics are markedly improved when the thick grading layers are employed.

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