Plasma-induced effects on the thermal conductivity of hydride vapor phase epitaxy grown n-GaN/Sapphire (0001)

D. I. Florescu, Fred H. Pollak, William B. Lanford, Farid Khan, I. Adesida, R. J. Molnar

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

We have measured high spatial/depth resolution (2-3 μm) thermal conductivity (κ) at 300K before and after plasma-induced effects on a series of n-GaN/sapphire (0001) samples fabricated by hydride vapor phase epitaxy (HVPE) using a ThermoMicroscope's scanning thermal microscope (SThM). The sample thicknesses were 50 ± 5 μm and the carrier concentrations ∼ 8 × 1016 cm-3, as determined by Hall effect measurements. The thermal conductivity before treatment was found to be in the 1.70 - 1.75 W/cm-K range, similar to that previously reported for HVPE material with this carrier concentration and thickness [D. I. Florescu et al., J. Appl. Phys. 88, 3295 (2000)]. The samples were processed under constant Ar gas flow and pressure for a fixed period of time (5 min). The only variable processing parameter was the DC bias voltage (125 - 500 V). After the initial 125 V procedure κ exhibited a decrease linear in the DC voltage in the investigated range. At 125 V the thermal conductivity was only slightly less (κ ∼ 1.65 W/cm-K) than the untreated case. κ had dropped to ∼ 0.3 W/cm-K for the 500 V situation. The implications of these results for device applications in the area of high power opto-electronics and high power electronics will be discussed.

Original languageEnglish
Pages (from-to)G11.57.1-G11.57.6
JournalMaterials Research Society Symposium - Proceedings
Volume639
Publication statusPublished - Dec 1 2001
EventGaN and Related Alloys 2000 - Boston, MA, United States
Duration: Nov 27 2000Dec 1 2000

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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