Cathodoluminescence studies of gamma-irradiation effects on AlGaN/GaN high electron mobility transistors (HEMTs)

Anupama Yadav, M. Antia, E. Flitsiyan, L. Chernyak, I. Lubomirsky, J. Salzman

Research output: Contribution to journalConference articlepeer-review

Abstract

The effects of 60Co gamma-irradiation on AlGaN/GaN High Electron Mobility Transistors (HEMTs) were studied by means of temperature dependent Cathodoluminescence (CL). The CL spectra were examined for several devices with radiation exposures of gamma-ray doses up to 1000 Gy, and for temperature ranging from 25°C to 125°C. Gamma-irradiation causes the CL intensity of HEMTs to decrease by creating defects that act as non-radiative recombination centers. The activation energy was observed to decrease as dosage was incremented to 200 Gy. The decrease in activation energy is related to Compton electron induced increase in carrier lifetime. However for doses above 200 Gy, the activation energy increases as the dose increases. This behavior could be explained by the formation of large electrically active defect complexes through the addition of new radiation defects to the defects formed at low doses.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalECS Transactions
Volume69
Issue number14
DOIs
StatePublished - Sep 2015
EventState-of-the-Art Program on Compound Semiconductors 58, (SOTAPOCS 58) (at the 228th ECS Meeting) - Phoenix, United States
Duration: 11 Oct 201515 Oct 2015
Conference number: 58

All Science Journal Classification (ASJC) codes

  • General Engineering

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