研究目的
Investigating the origin of a photoluminescence line near 1017 meV in Mg-doped 28Si and confirming the Mg-pair hypothesis through isotopic fingerprinting.
研究成果
The isotopic fingerprint of the 1017 meV photoluminescence line in Mg-doped 28Si confirms the Mg-pair hypothesis for the isoelectronic bound exciton center. The study also reveals unusual temperature-dependent behavior of the PL, which remains unexplained.
研究不足
The study is limited by the unusual and unexplained behavior of the PL with changing temperature, and the need for further optimization of diffusion and annealing conditions to maximize the intensity of the Mg-pair IBE.
1：Experimental Design and Method Selection:
High-resolution photoluminescence spectroscopy was used to study the isotopic fingerprint of the Mg-pair isoelectronic bound exciton in 28Si.
2：Sample Selection and Data Sources:
A sample of highly enriched 28Si diffused with natural Mg was used.
3：List of Experimental Equipment and Materials:
A Bruker IFS 125HR Fourier transform infrared spectrometer with a CaF2 beam splitter, liquid helium cryostat, 1030 and 1047 nm excitation sources, sharp-cut long-pass filters, and a liquid-nitrogen-cooled Ge PIN diode detector.
4：Experimental Procedures and Operational Workflow:
PL measurements were performed at various temperatures, with samples mounted to avoid strain and cooled in a liquid helium cryostat.
5：Data Analysis Methods:
The isotopic fingerprint was analyzed by fitting the observed spectrum to five mixed Gaussian–Lorentzian peaks.
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