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Materials | Transition-Metal Defects in Silicon - New Insights from Photoluminescence Studies of Highly Enriched

Transition-Metal Defects in Silicon

New Insights from Photoluminescence Studies of Highly Enriched 28Si

Series: Springer Theses

Steger, Michael

2013, XII, 97 p. 35 illus., 19 illus. in color.

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  • Nominated as an outstanding contribution by Simon Fraser University
  • Demonstrates the power of isotopic enrichment for high-resolution spectroscopic characterization
  • Records properties of transition metal centers in silicon with unprecedented accuracy
  • A valuable step towards the realization of silicon-based lighting
The fundamental properties of deep luminescence centres in Si associated with transition metals such as Cu, Ag, Au, and Pt have been a focus of interest for decades, both as markers for these deleterious contaminants, and also in the quest for efficient Si-based light emission.
 
This dissertation presents the results of ultra-high resolution photoluminescence studies of these centres in specially prepared, highly enriched 28-Si samples. The greatly improved spectral resolution due to this enrichment led to the discovery of isotopic fingerprints. These fingerprints have revealed that the detailed constituents of all of the centres previously studied had been identified incorrectly. They also revealed the existence of several different families of impurity complexes containing either four or five atoms chosen from Li, Cu, Ag, Au, and Pt. These centres’ constituents have been determined, together with no-phonon transition energies, no-phonon isotope shifts, local vibrational mode energies, and the isotope shifts of the local vibrational mode energies. The data presented here for these centres should prove useful for the currently sought theoretical explanations of their formation, stability, and properties.

Content Level » Research

Keywords » 28-Si Enrichment - High-resolution Optical Spectroscopy of Silicon - Isoelectronic Bound Exciton Centres in Silicon - Isotopic Fingerprints - Isotopically Enriched Silicon - Transition Metal Impurities in Silicon - Ultra-high Resolution Photoluminescence

Related subjects » Characterization & Evaluation of Materials - Materials - Optics & Lasers - Special types of Materials

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