Extended soft X-ray emission spectroscopy: quantitative assessment of emission intensities.
J Synchrotron Radiat
; 17(6): 791-8, 2010 Nov.
Article
en En
| MEDLINE
| ID: mdl-20975226
ABSTRACT
Soft X-ray emission spectroscopy (SXES) in the energy range between 150â
eV and 1500â
eV has typical attenuation lengths between tens and a few hundred nanometres. In this work the transmission of soft X-rays in synchrotron-based SXES has been quantitatively analysed using specially prepared layer samples. The possibility of extending the standard qualitative analysis of SXES by exploiting the information underlying the emission intensity was examined for thin layer structures. Three different experiment series were accomplished with model layer systems based on different sulfur-containing substrates (i) MoS(2), (ii) CuInS(2), (iii) Cu(In,Ga)(S,Se)(2). The absorption of the S L(2,3) emission line by ZnO cover layers of up to 80â
nm thickness was monitored and compared with theoretical expectations. By comparison with a reference intensity recorded from a bare substrate, the attenuation of the S L(2,3) emission could be used to accurately determine the ZnO overlayer thickness up to a critical thickness, depending on the set-up and the net S L(2,3) emission intensity. The results from these local energy-resolved spot measurements were compared with spatially resolved scans of the integral S L(2,3) emission intensity over areas of several mm(2). In the scan images the attenuation of the S L(2,3) emission intensity clearly reflects the local ZnO layer thickness. From the attenuation the ZnO layer thicknesses were calculated and compared with ellipsometric measurements and were found to be in excellent agreement. These results demonstrate the benefits of a quantitative analysis of SXES, making it an even more powerful tool for examining buried interfaces and for monitoring lateral inhomogeneities.
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1
Bases de datos:
MEDLINE
Tipo de estudio:
Qualitative_research
Idioma:
En
Revista:
J Synchrotron Radiat
Asunto de la revista:
RADIOLOGIA
Año:
2010
Tipo del documento:
Article
País de afiliación:
Alemania