Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 35: Thin Film Characterisation: Structure Analysis and Composition II

DS 35.9: Talk

Wednesday, March 9, 2016, 17:15–17:30, H8

Dependence of Optoelectronic Properties on Composition in CuInSe2 — •Sergiu Levcenco, Helena Stange, Roland Mainz, and Thomas Unold — Hahn-Meitner-Platz 1 D-14109 Berlin, Germany

Thin film solar cells based on chalcopyrite absorber have demonstrated more than 21% efficiency although the material used is strongly non-stoichiometric, and thus contains large quantities of defects. To investigate the effect of composition on the optoelectronic properties CuInSe2 samples were grown by coevaporation in with an intentional lateral variation of composition, leading to Cu-poor, Cu-rich and stoichiometric regions within the same sample. Photoluminescence, Raman spectroscopy and reflectometry was performed to investigate the optical and structural properties and recombination processes within on sample. The band gap is found to continuously increase when the composition approaches stoichiometry, whereas the recombination physics yields a much more complex behaviour.