Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 16, Pages 3067-3069Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1712034
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The contact formation of thin-film epitaxial CuInSe2(001) with a physical-vapor-deposited US layer is presented in this work. Synchrotron-excited photoelectron spectroscopy was used for this investigation. The epitaxial CuInSe2 films contain a surface layer of reduced Cu stoichiometry similar to the ordered defect compound CuIn3Se5. A valence band offset of 0.79+/-0.15 eV has been determined for this heterojunction. The comparison to literature data indicates that neither surface orientation nor surface copper content have a major impact on the valence band offset of CuIn3Se5, respectively, CuInSe2 with CdS. (C) 2004 American Institute of Physics.
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