کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1681860 | 1518731 | 2012 | 6 صفحه PDF | دانلود رایگان |
Single crystals of 6H-SiC were irradiated at room temperature and 670 K with 4 MeV C ions at two fluences: 1015 and 1016 cm−2 (0.16 and 1.6 dpa at the damage peak). Damage accumulation was studied by a combination of X-ray diffraction (XRD), Raman spectroscopy and Rutherford backscattering spectrometry in channelling geometry (RBS/C) along the [0 0 0 1] direction. The irradiated layer is found to be composed of a low damage region up to ∼1.5 μm followed by a region where the disorder level is higher, consistent with SRIM predictions. At room temperature and low fluence, typically 1015 cm−2, the strain depth profile follows the dpa depth distribution (with a maximum value of ∼2%). The disorder is most likely due to small defect clusters. When increasing the fluence up to 1016 cm−2, a buried amorphous layer forms, as indicated by e.g. Raman results where the Si–C bands become broader or even disappear. At a higher irradiation temperature of 670 K, amorphization is not observed at the same fluence, revealing a dynamic annealing process. However, results tend to suggest that the irradiated layer is highly heterogeneous and composed of different types of defects.
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 286, 1 September 2012, Pages 108–113