INVESTIGADORES
UREÑA Maria Andrea
congresos y reuniones científicas
Título:
Characterisation of thin films obtained by laser ablation of Ge28Se60Sb12 glasses
Autor/es:
MARIA ANDREA UREÑA; PIARRISTEGUY, A.; FONTANA, M.; VIGREAUX, C.; PRADEL, A.; ARCONDO, B.
Lugar:
Pardubice, Republica Checa
Reunión:
Congreso; 7th International Congress of the Solid State Chemistry (SSC 2006); 2006
Resumen:
Films of nominal composition Ge28Se60Sb12 were deposited on
microscope slides by pulsed laser deposition, using either bulk or powdered
glassy targets and a Nd:YAG laser (λ=266 nm). The films with thickness comprised
between 400 and 800 nm showed a smooth and dense morphology. They were
homogeneous in composition all over the samples with a composition somewhat
deficient in selenium compared to the nominal one:
Ge28.1±0.3Se56.1±0.1Sb15.8±0.2 and Ge29.0±0.3Se55.5±0.1Sb15.5±0.2 for films
obtained from powdered glassy targets and bulk targets respectively. The
optical characteristics of the films were extracted from the transmission
spectra recorded between 250 and 2500 nm. In particular the refractive index at
1.5 μm was found to be 2.75 ± 0.03, close to that of the bulk glass, as
expected for dense films.. The decrease in the optical band gap and the
increase in the Urbach absorption edge with the film thickness were attributed
to an increase in disorder