AlN/ITO-Based Hybrid Electrodes with Conducting Filaments: Their Application to Ultraviolet Light-Emitting Diodes

Kyeong Heon Kim, Tae Ho Lee, Tae Geun Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A hybrid-type transparent conductive electrode (H-TCE) structure comprising an AlN rod array with conducting filaments (CFs) and indium tin oxide (ITO) films is proposed to improve both current injection and distribution as well as optical transmittance in the UV region. These CFs, generated in UV-transparent AlN rod areas using an electric field, can be used as conducting paths for carrier injection from a metal to a semiconductor such as p-(Al)GaN, which allows perfect Ohmic behavior with high transmittance (>95% at 365 nm) to be obtained. In addition, conduction across AlN rods and Ohmic conduction mechanisms are investigated by analyzing AlN rods and AlN rod/p-AlGaN film interfaces. We apply these H-TCEs to three near-UV light-emitting diodes (LEDs) (385 nm LEDs with p-GaN and p-AlGaN terminated surfaces and 365 nm LED with p-AlGaN terminated surface). We confirm that the light power outputs increase by 66%, 79%, and 103%, whereas the forward voltages reduce by 5.6%, 10.2%, and 8.6% for 385 nm p-GaN terminated, 385 nm p-AlGaN terminated, and 365 nm p-AlGaN terminated LEDs with H-TCEs, respectively, compared to LEDs with reference ITOs.

Original languageEnglish
Pages (from-to)24357-24364
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number28
DOIs
Publication statusPublished - 2017 Jul 19

Keywords

  • AlN rod array
  • conducting filament
  • electrical breakdown
  • transparent conductive electrode
  • ultraviolet light-emitting diode

ASJC Scopus subject areas

  • Materials Science(all)

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