Low And Moderate Dose Gamma-Irradiation And Annealing Impact On Electronic And Electrical Properties Of Algan/Gan High Electron Mobility Transistors
Keywords
Activation energy; Diffusion length; Gamma irradiation; High electron mobility transistors; Wide-band-gap semiconductors
Abstract
To understand the effects of 60Co gamma-irradiation, systematic studies were carried out on n-channel AlGaN/GaN high electron mobility transistors. Electrical testing, combined with electron beam-induced current measurements, was able to provide critical information on defects induced in the material as a result of gamma-irradiation. It was shown that at low gamma-irradiation doses, the minority carrier diffusion length in AlGaN/GaN exhibits an increase up to ∼300Gy. The observed effect is due to longer minority carrier (hole) life time in the material's valence band as a result of an internal electron irradiation by Compton electrons. However, for larger doses of gamma irradiation (above 400Gy), deteriorations in transport properties and device characteristics were observed. This is consistent with the higher density of deep traps in the material's forbidden gap induced by a larger dose of gamma-irradiation. Moderate annealing of device structures at 200°C for 25min resulted in partial recovery of transport properties and device performance.
Publication Date
5-4-2015
Publication Title
Radiation Effects and Defects in Solids
Volume
170
Issue
5
Number of Pages
377-385
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1080/10420150.2015.1010170
Copyright Status
Unknown
Socpus ID
84940714068 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/84940714068
STARS Citation
Yadav, Anupama; Flitsiyan, Elena; Chernyak, Leonid; Hwang, Ya Hsi; and Hsieh, Yueh Ling, "Low And Moderate Dose Gamma-Irradiation And Annealing Impact On Electronic And Electrical Properties Of Algan/Gan High Electron Mobility Transistors" (2015). Scopus Export 2015-2019. 790.
https://stars.library.ucf.edu/scopus2015/790