DAFS - Universidad de Zaragoza

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$Difracción de Rayos X, neutrones y electrones$

Spatial selectivity : GaAs xP 1-x/GaAs epilayer GaAsP/GaAs thin film, (006) weak reflection, FWHM=0.02° Quick DAFS, assisted with feedback : 2000eV, 7 minutes !! Diffracted Intensity Intensité normalisée Χ(k) 0.2 0.1 0 0.05 χ(k) 0 -0.05 DAFS Ga Kedge 10500 11000 11500 12000 Energie (eV) 200ms/pt Energy 4 6 8 10 12 14 16 k (Å -1 k(Å ) -1 ) As Kedge 10 ms/pt EDAFS oscillations Ga Kedge 0.2 -0.2 0 0.2 -0.2 0.2 -0.2 -0.2 (006) reflection, Ga K-edge 0.2 0 0 0 2 4 6 8 10 12 k (Å -1 ) k(Å-1 ) FT ε = 0.4% [110] ε = 0.6% [110] ε = 0.7% [110] t=4000Å ε = 0.7% - [110] t=600Å 0 1 2 3 4 5 6 R (Å -1 ) R(Å) 16/50
TEM InAs/InP QWrs AFM 200nm GaN/AlN QDs Introduction Physical properties of nanostructures depend on : -The internal atomic structure (strain, composition, defects, ...) -The morphology (shape, size, size distribution, …) • Knowledge of the local structure at atomic scale and morphology of nano-islands during growth is a key to control and understand the growth mechanism (thermodynamic, growth kinetic) 17/50
Page 1 and 2: Universidad de Zaragoza Curso de Ma
Page 3 and 4: TÉCNICAS EXPERIMENTALES µ I diff
Page 5 and 6: EL DAFS El DAFS es la estructura fi
Page 7 and 8: Resonant atomic scattering factor f
Page 9 and 10: y 0 Structure factor: Multi-wavelen
Page 11 and 12: I F diff 0 F 0 Análisis de datos D
Page 13 and 14: Using the path formalism for descri
Page 15: Spatial selectivity : GaAs xP 1-x/G
Page 19 and 20: Local structure study of InAs/InP Q
Page 21 and 22: As-O As K-edge EXAFS (BM8-ESRF) Int
Page 23 and 24: Grazing incidence diffraction BM2-D
Page 25 and 26: GI-DAFS (Grazing Incidence DAFS) k(
Page 27 and 28: Diffraction Intensity (a.u.) GIDAFS
Page 29 and 30: Abs II EXAFS and EDAFS best fit res
Page 31 and 32: GIDAFS oscillations analysis CP1276
Page 33 and 34: EXAFS (ε // & ε ⊥) Similar resu
Page 35 and 36: Applications : Nanostructures III-V
Page 37 and 38: Applications : Nanostructures III-V
Page 39 and 40: BQ GaN/AlN 10ML : EXAFS vs DAFS k
Page 41 and 42: BQ GaN/AlN : EDAFS simulations h=2.
Page 43 and 44: Orden de carga y reflexiones prohib
Page 45 and 46: Estado electrónico de los sitios o
Page 47 and 48: Anisotropía del factor de dispersi
Page 49 and 50: Zona del umbral (DANES) Modelo refl
Page 51 and 52: Prepico Cálculos “ab initio” d
Page 53: Grazing Incidence Diffraction Anoma

DAFS - Universidad de Zaragoza

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