Irradiation effects on AlGaN HFET devices and GaN layers

  • AlGaN/GaN heterostructure field effect transistors (HFETs) were irradiated with protons as well as carbon, oxygen, iron and krypton ions of high (68 and 120 MeV) and low (2 MeV) energy with fluences in the range from 1x107 to 1x1013 cm-2. High energy irradiation with protons, carbon and oxygen produced no degradation in devices while krypton irradiation at the fluence of 1x1010 cm-2 resulted in a small reduction of 2% in the transconductance. Similarly, for GaN samples irradiated with protons, carbon and oxygen at high energy no changes were seen by XRD, PL and Hall effect, while changes in lattice constant and a reduction in PL intensity were observed after irradiation with high energy krypton. Low energy irradiation with carbon and oxygen at a fluence of 5x1010 cm-2 results in small change in the device performance while remarkable changes in device characteristics are seen at a fluence of 1x1012 cm-2 for carbon, oxygen, iron and krypton irradiation. Similarly changes are also observed by XRD, PL and Hall effect for the thick GaNAlGaN/GaN heterostructure field effect transistors (HFETs) were irradiated with protons as well as carbon, oxygen, iron and krypton ions of high (68 and 120 MeV) and low (2 MeV) energy with fluences in the range from 1x107 to 1x1013 cm-2. High energy irradiation with protons, carbon and oxygen produced no degradation in devices while krypton irradiation at the fluence of 1x1010 cm-2 resulted in a small reduction of 2% in the transconductance. Similarly, for GaN samples irradiated with protons, carbon and oxygen at high energy no changes were seen by XRD, PL and Hall effect, while changes in lattice constant and a reduction in PL intensity were observed after irradiation with high energy krypton. Low energy irradiation with carbon and oxygen at a fluence of 5x1010 cm-2 results in small change in the device performance while remarkable changes in device characteristics are seen at a fluence of 1x1012 cm-2 for carbon, oxygen, iron and krypton irradiation. Similarly changes are also observed by XRD, PL and Hall effect for the thick GaN layer irradiated at the fluence of 1x1012 cm-2. The device results and GaN layer properties are strongly correlated.show moreshow less

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Author: S. Gnanapragasam, E. Richter, F. Brunner, A. Denker, R. Lossy, M. Mai, Friedrich LenkGND, J. Opitz-Coutureau, G. Pensl, J. Schmidt, U. Zeimer, L. Wang, B. Krishnan, M. Weyers, Joachim Würfl, Günther Tränkle
DOI:https://doi.org/10.1007/s10854-008-9589-1
ISSN:1573-482X
Title of the source (English):Journal of Materials Science: Materials in Electronics
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2008
Volume/Year:19
Issue number:1
First Page:64
Last Page:67
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Nachrichtentechnik
Institution name at the time of publication:Fakultät für Ingenieurwissenschaften und Informatik (eHL) / Prof. Nachrichtentechnik
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