Hyperfine interaction study of the decoration of the internal wall of nanosized voids by impurity probes
Abstract
We observe the trapping of implanted radioactive 57Co atoms at empty nano-cavities formed in {111} Si by the desorption of He from bubbles. The absorption of 14.4 keV γ-rays roughly monitors the displacement of the activity, while anodic stripping and counting the remaining 122 keV γ-ray intensity is employed to obtain an accurate depth profile and to isolate the wanted fraction of the sample. Mössbauer spectroscopy shows that only damage and/or CoSi 2-nuclei related sites are present in samples implanted at 300 and 400°C. In a sample implanted with Co at RT at the same side as the cavity-generating He atoms, the Mössbauer spectra reveal two new quadrupole split components after 30 min annealing at 700°C. We present arguments for the tentative identification of these to a cavity edge site (79%, strong bonding) and to a cavity plane site (21%, weak bonding).
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- December 1995
- DOI:
- 10.1016/0168-583X(95)00713-X
- Bibcode:
- 1995NIMPB.106..252D