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Journal of Electronic Materials

, Volume 41, Issue 11, pp 3013–3016 | Cite as

Thermally Oxidized InAlN of Different Compositions for InAlN/GaN Heterostructure Field-Effect Transistors

  • P. KordošEmail author
  • M. Mikulics
  • R. Stoklas
  • K. Čičo
  • A. Dadgar
  • D. Grűtzmacher
  • A. Krost
Article

Properties of InAlN/GaN heterostructure field-effect transistors with thermally oxidized (750°C, 2 min) InAlN barrier layers of different compositions (InN = 13%, 17%, and 21%) were evaluated. The saturation drain current was inversely proportional to the InN content and was lower than that obtained with nonoxidized devices. From the capacitance measurement, the resulting sheet charge density decreased from 1.1 × 1013 cm−2 to 0.6 × 1013 cm−2 with increased InN content, and it was only approximately 50% of that of the nonoxidized counterparts. The oxide thickness of approximately 1 nm was extracted from the zero-bias capacitances. The pulsed measurements yielded a very high gate lag independent from the InAlN composition (the pulsed-to-static drain current ratio was ∼0.5 for a 200-ns pulse width). On the other hand, a significantly lower gate lag was observed on nonoxidized SiN x passivated InAlN/GaN devices. The results demonstrate that a high density of trap states was created in the thermally oxidized InAlN/GaN structures.

Keywords

InAlN/GaN HFETs thermal oxidation trap states 

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Copyright information

© TMS 2012

Authors and Affiliations

  • P. Kordoš
    • 1
    • 2
    Email author
  • M. Mikulics
    • 3
  • R. Stoklas
    • 1
  • K. Čičo
    • 1
  • A. Dadgar
    • 4
  • D. Grűtzmacher
    • 3
  • A. Krost
    • 4
  1. 1.Department of MicroelectronicsSlovak University of TechnologyBratislavaSlovakia
  2. 2.Institute of Electrical EngineeringSlovak Academy of SciencesBratislavaSlovakia
  3. 3.Research Centre JülichJülichGermany
  4. 4.Institute of Experimental PhysicsUniversity MagdeburgMagdeburgGermany

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