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- Nguyen, Son Tien, 1953-, et al.
(author)
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Optically detected magnetic resonance studies of intrinsic defects in 6H-SiC
- 1999
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In: Semiconductor Science and Technology. - 0268-1242 .- 1361-6641. ; 14:12, s. 1141-1146
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Journal article (peer-reviewed)abstract
- Optically detected magnetic resonance (ODMR) was used for study of defects in n-type 6H-SiC. Four ODMR spectra related to spin S = 1 centres were observed. Two of these centres, labelled a and b, have a trigonal symmetry with the symmetry axis along the c-axis of the hexagonal crystal. For the other two centres, labelled c and d, the symmetry is lower (C1h) and the principal axis z of the g- and D-tensor is about 71 degrees off the c-axis. Based on the symmetry axes, the annealing behaviour and the intensity, these spectra are suggested to originate from different configurations of the paired centre between a silicon vacancy and a nearest-neighbour point defect (either a carbon vacancy or a silicon antisite), occupying different inequivalent sites in the 6H-SiC. These defects are non-radiative and act as efficient recombination channels in the material.
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