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Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji
Physica Status Solidi (C), 9(10-11), p.1884 - 1887, 2012/10
Times Cited Count:4 Percentile:88.47(Materials Science, Multidisciplinary)We report enhancement of intrinsic photoluminescence (PL) from -FeSi nanocrystals by doping carbon. In the appropriate dose of C 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 -FeSi nanocrystals.
Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji
Physica Status Solidi (C), 9(10-11), p.1888 - 1891, 2012/10
Times Cited Count:3 Percentile:83.25(Materials Science, Multidisciplinary)We have systematically investigated photoluminescence (PL) properties of -phase nanocrystals which are formed by a phase transition from metastable -FeSi with a Fluorite structure to -FeSi, and succeeded in enhancement of the PL intensity in the optimum conditions of double annealing process. For the PL enhancement, the time of postannealing at 800C is dominated by the time of the preannealing at 400 or 500C which is related to amount of the -phase. After discussing some possible factors, we speculate that the PL enhancement observed in this study may be attributed mainly to improvement of the interface condition between the nanocrystal and Si, because the crystallographic epitaxial relationship among the phases, Si(111)//(111)//(202)/(220) can be maintained during precipitation of the nanocrystal on Si(111).
Matsukura, Bui*; Nakajima, Takahito*; Maeda, Yoshihito; Narumi, Kazumasa; Terai, Yoshikazu*; Sado, Taizo*; Hamaya, Kohei*; Miyao, Masanobu*
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no abstracts in English
Matsukura, Bui*; Nakajima, Takahito*; Nishimura, Kentaro*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
no abstracts in English
Nakajima, Takahito*; Nishimura, Kentaro*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito
no journal, ,
no abstracts in English
Nishimura, Kentaro*; Nakajima, Takahito*; Nagasawa, Yoshiyuki*; Narumi, Kazumasa; Maeda, Yoshihito*
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