Possible ohmic mechanisms of Ag/indium tin oxide p-type contacts for high-brightness GaN -Based light emitting diodes

June O. Song, Hyun G. Hong, Joon W. Jeon, Jung I. Sohn, Ja Soon Jang, Tae Yeon Seong

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15 Citations (Scopus)

Abstract

We have investigated the Ag (1 nm)indium tin oxide (ITO) (200 nm) contacts by scanning transmission electron microscopy (STEM), Auger electron spectroscopy (AES), and X-ray photoemission spectroscopy (XPS) to understand its ohmic mechanism. The Ag/ITO contacts exhibit ohmic behaviors, when annealed at 400-600°C. The effective Schottky barrier heights depend on the annealing temperatures. STEM and AES results reveal the formation of Ag nanodots (5-35 nm across) and Ga-Ag solid solution. Based on the STEM, AES, and XPS results, the ohmic contact formation is described in terms of the formation of the Ga-Ag solid solution and the inhomogeneous interfaces with nanodots.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume11
Issue number2
DOIs
Publication statusPublished - 2008 Jan 4

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ASJC Scopus subject areas

  • Electrochemistry
  • Materials Science(all)

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