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Identification of Impurity Phases in Cu2ZnSnS4 Thin-film Solar Cell Absorber Material by Soft X-ray Absorption Spectroscopy

  • M. Bär (a1), B.-A. Schubert (a1), R.G. Wilks (a1), B. Marsen (a1), Y. Zhang (a2), M. Blum (a2) (a3), S. Krause (a2), W. Yang (a3), T. Unold (a1), L. Weinhardt (a4), C. Heske (a4) and H.-W. Schock (a1)...

The composition of Cu2ZnSnS4 thin-film solar cell absorbers was varied to induce the.formation of secondary impurity phases. For their identification, the samples have been investigated by Cu L3 and S L2,3 soft x-ray absorption (XAS) spectroscopy. We find that Cu L3 XAS is especially sensitive to the presence of copper sulfides as well as copper oxides and/or changes in the electron configuration, suggesting a basis for future studies of the surface, defect, and interface characterization of similar samples. Additionally, it is shown that the S L2,3 absorption data can be used as a very sensitive probe of the variations in the prevalence of S-Zn bonds in the near-surface region of the investigated samples.

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