ITO/AlN rod-based hybrid electrodes: effect of buffer layers in AlN rods on performance of 365-nm light-emitting diodes

Kyeong Heon Kim, Tae Ho Lee, Kyung Rock Son, Tae Geun Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, hybrid electrodes consisting of AlN rod arrays and surrounding indium tin oxide (ITO) films are proposed, and the effect of buffer layers in AlN rods on the performance of 365-nm light-emitting diodes (LEDs) is investigated. The AlN rod arrays were introduced in the form of ITO/AlN/buffer layers (Cr/Ni or thin ITO) to reduce the area and voltage for electrical breakdown (EBD), which is used to form conductive channels. The surrounding ITO film was used as a current spreading layer. Using this electrode design, we observed improved ohmic behavior and a higher transmittance at 365 nm compared to those of the reference ITO. In addition, both conduction and ohmic conduction mechanisms in the structure comprising a metal, AlN rod film, and p-AlGaN surface were investigated using various analysis tools. As a result, the 365-nm LEDs with thin Cr/Ni buffer layers exhibited a significantly higher light output power, lower forward voltages, and lower leakage currents than the LEDs with thin ITO buffer layers and reference ITOs.

Original languageEnglish
Pages (from-to)172-178
Number of pages7
JournalApplied Surface Science
Volume477
DOIs
Publication statusPublished - 2019 May 31

Keywords

  • Conducting filaments
  • Electrical breakdown
  • Transparent conductive electrodes
  • Ultraviolet light-emitting diodes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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