Features of gettering during irradiation of Cr /4H-SiC photodetectors with argon ions
Kalinina E. V.1, Nikitina I. P.1, Kudoyarov M. F.1, Patrova M. Ya.1, Zabrodsky V. V.1, Yusupova Sh. A.1
1Ioffe Institute, St. Petersburg, Russia
Email: evk@mail.ioffe.ru
The paper presents the results of the effect of stepwise irradiation 7 times with argon (Ar) ions with an energy of 53 MeV and a fluence of 1·1010 cm-2 (total fluence 7·1010 cm-2) on the structural and optical characteristics of ultraviolet Cr/4H-SiC photodetectors. It is shown that the features of the spectral characteristics in the range of 200-400 nm are determined by gettering of simple radiation defects of vacancy nature by cluster formations in 4H-SiC. The cyclic nature of the gettering effect was confirmed during successive seven-fold irradiation of Cr/4H-SiC photodetectors with argon ions with a fluence of 7·1010 cm-2, which was first observed with proton irradiation. Keywords: Silicon carbide, irradiation, argon, gettering, external quantum efficiency, X-ray.
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