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Theses
Local structure of dilute nitrides and effects of post-growth treatments
Local structure of dilute nitrides and effects of post-growth treatments
Abstract : THIS THESIS ADDRESSES THE ISSUE OF A STRUCTURAL CHARACTERIZATION OF THE TECHNOLOGICALLY IMPORTANT III-V DILUTE NITRIDES GAASN AND INGAASN, PROVIDING A USEFUL FRAME TO BETTER UNDERSTAND THE ANOMALOUS OPTICAL PROPERTIES THAT HAVE BEEN OBSERVED FOR EIGHT YEARS AND ARE NOWADAYS EXPLOITED IN OPTOELECTRONIC DEVICES DESIGN. THE MAIN TECHNIQUES USED WERE X-RAY ABSORPTION SPECTROSCOPY (XAS) AND X-RAY DIFFRACTION (XRD). DIFFRACTION ANOMALOUS FINE STRUCTURE (DAFS) TOOK ALSO A LIMITED BUT MEANINGFUL ROLE IN THIS WORK. THE SUBJECTS ADDRESSED IN THIS THESIS WERE THE SHORT RANGE ORDERING IN INGAASN AND THE EFFECTS OF POST-GROWTH ANNEALING ON THE LOCAL STRUCTURE, THE COMPOSITION DEPENDENCE OF THE BOND LENGTHS AT THE N-DILUTE LIMIT IN GAASN, AND THE EFFECTS OF HYDROGENATION ON THE STRUCTURE OF DILUTE NITRIDES. WE GAVE EVIDENCE FOR THE PRESENCE OF A PREFERENTIAL IN-N BONDING OVER IN-AS IN INGAASN DRIVEN BY THERMAL ANNEALING, AND OF A REMARKABLE RELAXATION OF THE UNIT CELL UPON HYDROGENATION
https://tel.archives-ouvertes.fr/tel-00124342
Contributor : Gianluca Ciatto <>
Submitted on : Monday, January 15, 2007 - 3:22:40 PM
Last modification on : Monday, January 15, 2007 - 3:36:08 PM
Long-term archiving on: : Friday, September 21, 2012 - 10:10:32 AM
Contributor : Gianluca Ciatto <>
Submitted on : Monday, January 15, 2007 - 3:22:40 PM
Last modification on : Monday, January 15, 2007 - 3:36:08 PM
Long-term archiving on: : Friday, September 21, 2012 - 10:10:32 AM