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In this paper we investigate the F behavior in Ge during solid phase epitaxy (SPE) and post-SPE annealing. Fluorine implanted with a fluence of 1 × 1015 F/cm2 and an energy of 35 keV induced the formation of an amorphous Ge layer. Detailed chemical and structural characterizations of the as implanted and annealed samples evidenced a strong segregation of F at the moving amorphous/crystalline interface, leading to a remarkable SPE rate retardation. In addition, we observed that F accumulates in correspondence of the end of range (EOR) defects. The comparison between the thermal evolution of damage produced by self-implantation and F implantation in Ge suggests that F increases significantly the stability of EOR. Such behavior clarifies the role of F in modifying the As diffusion in Ge recently reported in literature.
Publication date: 
1 Jul 2012

S Boninelli, G Impellizzeri, F Priolo, E Napolitani, C Spinella

Biblio References: 
Volume: 282 Pages: 21-24
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms