Mg-pair isoelectronic bound exciton identified by its isotopic fingerprint in Si-28

Article

关键词: IONIZED MAGNESIUM DONORS;    BERYLLIUM;    ACCEPTOR;    IMPURITIES;    DIFFUSION;    SPECTRA;   

DOI  :  10.1103/PhysRevB.98.205203

来源: SCIE

【 摘 要 】

We use the greatly improved optical linewidths provided by highly enriched Si-28 to study a photoluminescence line near 1017 meV previously observed in the luminescence spectrum of natural Si diffused with Mg and suggested to result from the recombination of an isoelectronic bound exciton localized at a Mg-pair center. In Si-28, this no-phonon line is found to consist of five components whose relative intensities closely match the relative abundances of Mg pairs formed by random combinations of the three stable isotopes of Mg, thus confirming the Mg-pair hypothesis. We further present the results of temperature-dependence studies of this center that reveal unusual and as-yet unexplained behavior.

【 授权许可】

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