Quantitative tem study of nitride semiconductors

Quantitative transmission electron microscopy study of iii-nitride semiconductor nanostructures

Maxim Korytov - Collection Omn.univ.europ.

196 pages, parution le 12/11/2010

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Résumé

The theoretical part of this work is dedicated to the adaptation of high-resolution transmission electron microscopy for studying III-nitride semiconductors. First, the principle of heterostructure composition evaluation by means of atomic displacement measurement is stated. The comparison of two strain measurement techniques, geometric phase analysis and projection method, is then presented. Finally, the effects of acquisition conditions on the strain measurements were elaborated. The experimental part of this work is dedicated to the characterization of GaN quantum dots (QDs) grown on AlGaN templates. This study revealed several phenomena original for nitride semiconductors. The surface QD shape depends on the GaN layer thickness, whereas the buried QD shape and volume are influenced by the QD capping. Moreover, a phase separation occurs in the AlGaN barriers. To explain the observed phenomena, various models founded on the principle of total energy minimization have been developed. Several approaches, based on the results of this study and aimed for the improvement of the optoelectronic devices properties, are also proposed.

Caractéristiques techniques

	PAPIER
Éditeur(s)	Editions universitaires européennes
Auteur(s)	Maxim Korytov
Collection	Omn.univ.europ.
Parution	12/11/2010
Nb. de pages	196
Format	15 x 22
Couverture	Broché
Poids	296g
EAN13	9786131545009