ITO/Ag/AlN/Al2O3 multilayer electrodes with conductive channels: Application in ultraviolet light-emitting diodes

Byeong Ryong Lee, Tae Ho Lee, Kyung Rock Son, Tae Geun Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

There have been considerable efforts to use oxide/metal/oxide (OMO) multilayers as transparent conductive electrodes (TCEs) for various optoelectronic devices. However, it was difficult to achieve high transmittances in the UV region because relatively narrow-bandgap oxide films such as indium tin oxide (ITO) and ZnO have been used to achieve low series resistances. In this study, ITO/Ag/AlN/Al2O3-based TCEs were fabricated by incorporating conductive channels in AlN/Al2O3 wide-bandgap bilayers under electric fields. These multilayered films exhibited much higher transmittances in the UV region and lower sheet resistances compared to the reference ITO and ITO/Ag/ITO electrodes. These films were then applied in GaN-based near-UV LEDs, following the investigation of ohmic conduction mechanisms at the interface between p-GaN and ITO/Ag/AlN/Al2O3 TCE layers. The LEDs with ITO/Ag/AlN/Al2O3 multilayers exhibited much lower forward voltages and higher output powers than those of the other two LEDs. This method offers a new and effective route to enhance the transmittance of OMO-based TCEs at a shorter wavelength without losses in electrical conductivity.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalJournal of Alloys and Compounds
Volume741
DOIs
Publication statusPublished - 2018 Apr 15

Fingerprint

Tin oxides
Indium
Light emitting diodes
Multilayers
Electrodes
Oxides
Energy gap
Metals
Sheet resistance
Ultraviolet Rays
indium tin oxide
Optoelectronic devices
Oxide films
Electric fields
Wavelength
Electric potential

Keywords

  • Conductive channel
  • Oxide metal oxide
  • Transparent conductive electrode
  • Ultraviolet light-emitting diode
  • Wide bandgap

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

ITO/Ag/AlN/Al2O3 multilayer electrodes with conductive channels : Application in ultraviolet light-emitting diodes. / Lee, Byeong Ryong; Lee, Tae Ho; Son, Kyung Rock; Kim, Tae Geun.

In: Journal of Alloys and Compounds, Vol. 741, 15.04.2018, p. 21-27.

Research output: Contribution to journalArticle

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