Study of the damage produced in 6H-SiC by He irradiation |
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Authors: | BS Li CH Zhang HH Zhang T Shibayama YT Yang |
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Affiliation: | aInstitute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;bJiangxi Key Laboratory of Surface and Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China;cCenter for Advanced Research of Energy Technology, Hokkaido University, Sapporo 060-8628, Japan |
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Abstract: | Lattice damage and evolution in 6H-SiC under He+ ion irradiation have been investigated by the combination of Rutherford backscattering in channeling geometry (RBS/C), Raman spectroscopy, UV–visible spectroscopy and transmission electron microscopy (TEM). 6H-SiC wafers were irradiated with He ions at a fluence of 3 × 1016 He+cm−2 at 600 K. Post-irradiation, the samples were annealed in vacuum at different temperatures from 873 K to 1473 K for isochronal annealing (30 min). Thermally annealed He irradiated 6H-SiC exhibited an increase in damage or reverse annealing behavior in the damage peak region. The reverse annealing effect was found due to the nucleation and growth of He bubbles. This finding was consistent with the TEM observation. The thermal annealing brought some recovery of lattice defects and therefore the intensities of Raman peaks increased and the absorption coefficient decreased with increasing annealing temperature. The intensity of Raman peak at 789 cm−1 as a function of annealing temperature was fitted in terms of a thermally activated process which yielded activation energy of 0.172 ± 0.003 eV. |
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Keywords: | He irradiation 6H-SiC Annealing Lattice damage |
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