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RHEED Pole Figure Measurements of Biaxial Thin Film Growth Front Evolution

Published online by Cambridge University Press:  07 March 2011

Gwo-Ching Wang
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute 110, 8th Street, Troy, NY 12180
Yu Liu
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute 110, 8th Street, Troy, NY 12180
Churamani Gaire
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute 110, 8th Street, Troy, NY 12180
Wen Yuan
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute 110, 8th Street, Troy, NY 12180
Toh-Ming Lu
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute 110, 8th Street, Troy, NY 12180
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Abstract

The most frequently used characterization technique for biaxial texture formation in thin films is x-ray pole figure analysis. However, x-rays interact weakly with matter and can penetrate a few microns deep into the film. The texture obtained by x-rays is therefore an average texture from the entire thickness of the film. As the texture of a film often changes during growth, information on the basic mechanisms that control the final texture is often lost. In contrast electrons interact strongly with matter and they have very limited penetration and escape depths of a few nm. In this paper we will show how we can use our newly developed reflection high energy electron diffraction (RHEED) surface pole figure technique to probe the surface texture evolution of the growth front from the initial stage (nm thick) to the later stage. The RHEED pole figure technique is a surface-sensitive technique that allows us to obtain information on the dynamic behavior of texture evolution of the growth front during film deposition. We shall explain the principle, measurement, and construction of such RHEED surface pole figures. An example of the biaxial texture evolution of CaF2 due to the atomic shadowing effect during oblique angle deposition is described.

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Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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