The quantitative characterization of SiGe layers by analysing rocking profiles in CBED patterns.
J Microsc
; 194(1): 12-20, 1999 Apr.
Article
em En
| MEDLINE
| ID: mdl-10320536
ABSTRACT
Convergent beam electron diffraction is used for the quantitative determination of layer thickness, composition and strain in pseudomorphic Si/SiGe two- and three-layer systems grown by molecular beam epitaxy. By using plan-view specimens, we are able to avoid the influence of surface relaxation which generally complicates the determination of strains in cross-sectional specimens. For quantitative strain determination, rocking curves of Bragg lines in energy-filtered convergent beam electron diffraction patterns are analysed. The experimentally obtained rocking curves are compared with kinematical calculations by a computerized fit procedure. The resulting layer parameters are then further refined by a dynamical simulation. Results for the strains obtained with this technique are in good agreement with theoretical values. With this method layer thickness is measured down to monolayer precision. The accuracy of the strain analysis depends on the sequence and thickness of the layers.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Microsc
Ano de publicação:
1999
Tipo de documento:
Article