Michael Steger

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.

New Insights from Photoluminescence Studies of Highly Enriched 28Si

Transition-Metal Defects in Silicon

Antonelle Delle Fave

Lindsay G. Oades

Jonathan Passmore

A state-of-the-art psychological perspective on positivity and strengths-based approaches at work This handbook makes a unique contribution to organizational psychology and HRM by providing comprehensive international coverage of the contemporary field of positivity and strengths-based approaches at work. It provides critical reviews of key topics such as resilience, wellbeing, hope, motivation, flow, authenticity, positive leadership and engagement, drawing on the work of leading thinkers including Kim Cameron, Shane Lopez, Peter Clough and Robert Biswas-Diener.

Michael Steger

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