Low symmetry configurations of vacancy-oxygen complexes in irradiated silicon

Y. Kusano, H. Saito, L. S. Vlasenko, M. P. Vlasenko, E. Ohta, Kohei M Itoh

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Abstract

Two new electron paramagnetic resonance (EPR) spectra, labeled KU2 and KU3, emerge as a result of annealing of γ-ray irradiated silicon crystals in the temperature range 360-560 °C. The EPR intensities of KU2 and KU3 increase in the upper range of the annealing temperature where the EPR peaks of the vacancy-oxygen complex (A-center) diminish. The angular dependence study shows that the EPR spectra of KU2 and KU3 resemble that of SL1, the excited triplet (spin S = 1) state of A-centers, but with slightly different g and D-tensors representing lowering in symmetries. Microscopic lattice distortions caused by capturing of extra interstitial oxygen atoms by the A-centers are proposed to be the source of lowering of the symmetries associated with KU2 and KU3.

Original languageEnglish
Article number245703
JournalJournal of Applied Physics
Volume118
Issue number24
DOIs
Publication statusPublished - 2015 Dec 28

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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