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Influence of the Cu Content on Structural and Vibrational Properties in Polycrystalline CuGaSe2 Thin Films

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Abstract

We studied CuGaSe2 (CGS) thin films with different Cu contents by means of X-ray diffraction (XRD) and micro-Raman spectroscopy. The CGS absorbers were deposited by co-evaporation on Mo/glass substrates. We found a clear shift of the CGS Raman mode frequencies to lower values with increasing Cu/Ga ratio. This is in direct correlation with the increasing lattice constants a and c extracted from XRD patterns. Influence of stress on the obtained results can be neglected, because very small stress values below 50 MPa were determined with the sin2Ψ method.

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  1. Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Industriestrasse 6, Stuttgart, D-70565, Germany

    Wolfram Witte, Robert Kniese & Michael Powalla

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  1. Wolfram Witte
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  2. Robert Kniese
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Witte, W., Kniese, R. & Powalla, M. Influence of the Cu Content on Structural and Vibrational Properties in Polycrystalline CuGaSe2 Thin Films. MRS Online Proceedings Library 1165, 520 (2009). https://doi.org/10.1557/PROC-1165-M05-20

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