Objective
The behaviour of contaminants in silicon, particularly transition metals, has been studied. The optically active centres introduced by the presence of copper, iron, gold and silver were studied in detail. The luminescence bands showed a striking similarity in excited state structure and vibronic properties. Copper and iron systems were analysed under uniaxial stress and magnetic field. Defect signatures were obtained for contaminationby copper, iron, nickel or gold.
A model was developed to explain the optical properties exhibited by the defects, especially the excited states structure and luminescence efficiency. It describes the defects as deep donors, with a highly localized ground. A state and extended shallow excited states, derived from band states.
A rich source of data on defects produced by transition metal impunities in silicon has been discovered. Optical spectra with strong sharp zero phonon lines and detailed side bands have been identified and recorded independently in the course of preliminary and limited studies by the two partners. In this project silicon samples implanted with iron, nickel, copper, gold, manganese and zinc will be subjected to photoluminescence. The Dublin laboratory will concentrate on the measurement of spectral band shapes, high resolution spectroscopy as a function of temperature and on the annealing behaviour of the centres. This will be supplemented by uniaxial stress studies and DLTS. In Aveiro the Zeeman spectroscopy of the zero phonon spectral lines will be the dominant technique as well as general luminescence and stress splitting. Isotope
doping by ion-implantation will be employed to determine the elements and numbers of atoms involved those defects. The data generated by this combination of studies should enable rapid progress to be made in identifying the details of the defects involved.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry transition metals
- natural sciences physical sciences atomic physics
- natural sciences chemical sciences inorganic chemistry metalloids
- natural sciences physical sciences optics spectroscopy
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Coordinator
3810-193 AVEIRO
Portugal
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