Low symmetry configurations of vacancy-oxygen complexes in irradiated silicon

作者：Kusano Y; Saito H; Vlasenko L S; Vlasenko M P; Ohta E; Itoh K M^*

来源：Journal of Applied Physics, 2015, 118(24): 245703.

DOI：10.1063/1.4938199

Two new electron paramagnetic resonance (EPR) spectra, labeled KU2 and KU3, emerge as a result of annealing of gamma-ray irradiated silicon crystals in the temperature range 360-560 degrees 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.

• 出版日期2015-12-28