Obiettivo
In natural germanium, results on the atomic and electronic structure of impurities and complexes due to irradiation centres or thermally induced defects are scarce. This is linked with the difficulty to extract useful data from resonance methods like electron paramagnetic resonance (EPR), infrared vibrational spectroscopy, or phonon resonance because of the multiplicity of components due to nuclear spin or isotopes of different masses. The number of components is drastically reduced in monoisotopic 74Ge and 76Ge crystals with zero nuclear spin.
This project will use the resonance methods with specially grown monocrystals to study interstitial oxygen and different oxygen-related centres produced by electron irradiation or thermal treatments. The combined use of the methods will yield unequivocal results on the atomic and electronic structure of these centres in the monoisotopic samples. This requires the fabrication of oxygen-doped monocrystalline samples and their investigation at very low temperature after appropriate treatments.
This will be achieved by a collaboration between the research team in Kiev, which has expertise in growth and characterisation of monoisotopic Ge crystals, and in Amsterdam, Paris, and Stuttgart, which are specialised in the study of point defects in semiconductors by EPR, optical spectroscopy, and phonon resonance spectroscopy. Previous results obtained in Kiev have shown the pertinence of such a goal.
Argomento(i)
Invito a presentare proposte
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75251 Paris
Francia