Silver-induced activation for improving the electrical characteristics of GaN-based vertical light-emitting diodes

Jae Seong Park, Joon Woo Jeon, Tae Yeon Seong

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3 Citations (Scopus)

Abstract

Silver (Ag) contacts are important reflectors for vertical-structure GaN-based light-emitting diodes (LEDs). The Ag contacts produce good electrical and optical properties at different annealing temperatures. Thus, in order to best optimize the reliability of LEDs, we introduced an Ag activation process before performing normal annealing treatments. In other words, after removing 200-nm-thick Ag layers on p-GaN that were annealed at 500°C for 1 min, Ag films were deposited on the Ag-activated p-GaN, which were subsequently annealed at 300°C for 1 min. The activated LEDs fabricated with the 300°C-annealed Ag contacts reveal better electrical properties than the reference LEDs. For example, the activated LEDs give a forward voltage of 2.92 V at an injection current of 20 mA, whereas the reference LEDs with the 300- and 500°C-annealed Ag contacts yield 3.02 and 2.98 V at 20 mA, respectively. The activated LEDs yield 4.9% and 17% higher output power (at 30 mW) than the reference LEDs with the Ag contacts annealed at 300 and 500°C. The activation-induced electrical improvement is briefly described and discussed.

Original languageEnglish
Pages (from-to)377-380
Number of pages4
JournalCurrent Applied Physics
Volume13
Issue number2
DOIs
Publication statusPublished - 2013 Mar 1

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Keywords

  • Activation
  • Ag
  • Ohmic contact
  • Vertical LED

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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