Abstract

We report on the temperature-dependent contact resistivity and high-temperature stability of the annealed Ni/Au ohmic contacts to p-type GaN in air. As the measure temperature increases from 25°C to 390°C, both the specific contact resistivity (ρc) and sheet resistance (Rsh) decrease by factors ∼10, contributing to the 10-fold increase in current at 390°C compared with that at 25°C. It was also observed that the ρc was further reduced by 36%, i.e., from 2.2 × 10−3 Ω cm2 to 1.4 × 10−3 Ω cm2, during the 48-h high-temperature stability test at 450°C in air, showing excellent stability of the contacts. An increase in ρc was observed after the contacts were subjected to 500°C in air. Higher temperature stress led to a significant increase in ρc. The contacts show rectifying I–V characteristics after being subjected to 700°C for 1 h. The degradation mechanics were analyzed with the assistance of transmission electron microscopy and energy dispersive x-ray spectroscopy.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalJournal of Electronic Materials
DOIs
StateAccepted/In press - Dec 29 2015

Fingerprint

Ohmic contacts
electric contacts
temperature dependence
air
Air
stability tests
electrical resistivity
Temperature
x ray spectroscopy
electron energy
degradation
Sheet resistance
transmission electron microscopy
temperature
Mechanics
Spectroscopy
Transmission electron microscopy
Degradation
X rays

Keywords

  • high-temperature electronics
  • Ni/Au ohmic contacts
  • p-type GaN
  • specific contact resistivity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Temperature Dependence and High-Temperature Stability of the Annealed Ni/Au Ohmic Contact to p-Type GaN in Air. / Zhao, Shirong; McFavilen, Heather; Wang, Shuo; Ponce, Fernando; Arena, Chantal; Goodnick, Stephen; Chowdhury, Srabanti.

In: Journal of Electronic Materials, 29.12.2015, p. 1-5.

Research output: Contribution to journalArticle

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abstract = "We report on the temperature-dependent contact resistivity and high-temperature stability of the annealed Ni/Au ohmic contacts to p-type GaN in air. As the measure temperature increases from 25°C to 390°C, both the specific contact resistivity (ρc) and sheet resistance (Rsh) decrease by factors ∼10, contributing to the 10-fold increase in current at 390°C compared with that at 25°C. It was also observed that the ρc was further reduced by 36{\%}, i.e., from 2.2 × 10−3 Ω cm2 to 1.4 × 10−3 Ω cm2, during the 48-h high-temperature stability test at 450°C in air, showing excellent stability of the contacts. An increase in ρc was observed after the contacts were subjected to 500°C in air. Higher temperature stress led to a significant increase in ρc. The contacts show rectifying I–V characteristics after being subjected to 700°C for 1 h. The degradation mechanics were analyzed with the assistance of transmission electron microscopy and energy dispersive x-ray spectroscopy.",
keywords = "high-temperature electronics, Ni/Au ohmic contacts, p-type GaN, specific contact resistivity",
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AU - Zhao, Shirong

AU - McFavilen, Heather

AU - Wang, Shuo

AU - Ponce, Fernando

AU - Arena, Chantal

AU - Goodnick, Stephen

AU - Chowdhury, Srabanti

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N2 - We report on the temperature-dependent contact resistivity and high-temperature stability of the annealed Ni/Au ohmic contacts to p-type GaN in air. As the measure temperature increases from 25°C to 390°C, both the specific contact resistivity (ρc) and sheet resistance (Rsh) decrease by factors ∼10, contributing to the 10-fold increase in current at 390°C compared with that at 25°C. It was also observed that the ρc was further reduced by 36%, i.e., from 2.2 × 10−3 Ω cm2 to 1.4 × 10−3 Ω cm2, during the 48-h high-temperature stability test at 450°C in air, showing excellent stability of the contacts. An increase in ρc was observed after the contacts were subjected to 500°C in air. Higher temperature stress led to a significant increase in ρc. The contacts show rectifying I–V characteristics after being subjected to 700°C for 1 h. The degradation mechanics were analyzed with the assistance of transmission electron microscopy and energy dispersive x-ray spectroscopy.

AB - We report on the temperature-dependent contact resistivity and high-temperature stability of the annealed Ni/Au ohmic contacts to p-type GaN in air. As the measure temperature increases from 25°C to 390°C, both the specific contact resistivity (ρc) and sheet resistance (Rsh) decrease by factors ∼10, contributing to the 10-fold increase in current at 390°C compared with that at 25°C. It was also observed that the ρc was further reduced by 36%, i.e., from 2.2 × 10−3 Ω cm2 to 1.4 × 10−3 Ω cm2, during the 48-h high-temperature stability test at 450°C in air, showing excellent stability of the contacts. An increase in ρc was observed after the contacts were subjected to 500°C in air. Higher temperature stress led to a significant increase in ρc. The contacts show rectifying I–V characteristics after being subjected to 700°C for 1 h. The degradation mechanics were analyzed with the assistance of transmission electron microscopy and energy dispersive x-ray spectroscopy.

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