Helmholtz-zentrum Berlin Fuer Materialien Und Energie Gmbh

Helmholtz-zentrum Berlin Für Materialien Und Energie Gmbh

Thomas Unold

Hans-Werner Schock

Raik Hesse

Daniel Abou-Ras

Klaus Ellmer

A method for in situ determination of a material composition of optically thin layers deposited from a vapor phase onto a substrate includes irradiating the substrate with incoherent light of at least three different wavelengths, optically detecting in a spatially resolved manner a reflection intensity of a diffuse or a direct light scattering emanating from a deposited layer outside of a total reflection, concurrently providing numerical values of the detected reflection intensity to an optical layer model based on general line transmission theory, ascertaining values for the optical layer parameters of the deposited layer from the optical layer model for the at least three different wavelengths by numerically adapting the optical layer model to a time characteristic of the detected reflection intensities, and quantitatively determining a material composition of the deposited layer from the ascertained values by comparing the ascertained values to standard values.

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Potsdam, Germany

Thomas Unold