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Substitutional boron atoms in silicon experience an off-lattice displacement during ion-irradiation with energetic light ions at room temperature. The off-lattice displacement rate has been measured in a B-doped Si by channelling analyses using nuclear reaction (650 keV proton beam, 11B(p,α)8Be). The normalized channeling yield χ of B increases with the ion fluence until it saturates at a value smaller than 1. This indicates that B is not totally displaced in a random site. The carrier concentration in layer, measured by Van Der Pauw and Hall effect techniques, decreases during irradiation until complete de-activation of B occurs. The comparison of electrical and structural analyses is consistent with the formation of small, not electrically active B complexes stable at room temperature in presence of an excess of point defects.
Publication date: 
1 Aug 2006

L Romano, AM Piro, MG Grimaldi, E Rimini

Biblio References: 
Volume: 249 Issue: 1-2 Pages: 181-184
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms