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Photoluminescence properties of carbon-doped $$beta$$-FeSi$$_{2}$$ nanocrystals

Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji

We report enhancement of intrinsic photoluminescence (PL) from $$beta$$-FeSi$$_{2}$$ nanocrystals by doping carbon. In the appropriate dose of C$$_{60}$$$$^{+}$$ ion implantation into the average nanocrystal size of 14 nm, the PL intensity was enhanced by 260% and increase of the exciton binding energy of 1.8 meV in comparison with that of the non-doped nanocrystal. Furthermore, we found that there was a clear correlation between the PL enhancement and increase of the exciton binding energy. This important result suggests that carbon atoms doped in the silicide lattice may play as an isoelectronic trap and probably form bound excitons with stable states as predicted theoretically. We found a new mechanism of the PL enhancement for $$beta$$-FeSi$$_{2}$$ nanocrystals.

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