High-transmittance NiSc/Ag/ITO p-type ohmic electrode for near-UV GaN-based light-emitting diodes

Hyun Gi Hong, Hyunseok Na, Tae Yeon Seong, Takhee Lee, June O. Song, Kyung Kook Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report on the formation of NiSc(2.5 nm)/Ag(2.5 nm)/ITO(200 nm) transparent p-type Ohmic electrodes for GaN-based near-UV light-emitting diodes (LEDs). We show that the NiSc(2.5 nm)/Ag(2.5 nm)/ITO(200 nm) contacts become Ohmic with contact resistivity of 4.9 × 10-3 Ωcm 2 and a transmittance of 80 % at 400 nm when annealed at 630 °C for 1 min in air. Near-UV (400 nm) LEDs fabricated with the annealed NiSc/Ag/ITO p-contacts give a forward-bias voltage of 3.69 V at 20 mA and a series resistance of 21.1 Ω, which are better than those for Ni/Au contacts. Based on Auger electron spectroscopy and electrical results, possible Ohmic formation mechanisms are described.

Original languageEnglish
Pages (from-to)159-162
Number of pages4
JournalJournal of the Korean Physical Society
Volume51
Issue number1
DOIs
Publication statusPublished - 2007 Jul

Keywords

  • Contact resistivity
  • LED
  • Transmittance
  • p-type Ohmic contact

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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