DLTS investigations on CIGS solar cells from an inline co-evaporation system with RbF post-deposition treatment
Zentrum für Sonnenenergie- und Wasserstoffforschung Baden-Württemberg (ZSW), Meitnerstraße 1, 70563 Stuttgart, Germany
2 Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraße 13, 76131 Karlsruhe, Germany
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Received in final form: 16 December 2021
Accepted: 3 February 2022
Published online: 3 March 2022
In this study, Deep Level Transient Spectroscopy (DLTS) measurements have been performed on Cu(In,Ga)Se2 (CIGS) solar cells from an inline co-evaporation system. The focus of this investigation is directed on the effect of rubidium-fluoride (RbF)-post-deposition treatment (PDT) on the defects in the CIGS absorber layer. Different traps can be identified and their properties are calculated. Herein, different methods of evaluations have been used to verify the results. Specifically, one minority trap around 400 meV was found to show a significant reduction of the trap density due to the alkali treatment. In contrast, a majority trap at approximately 600 meV is unaffected.
Key words: CIGS solar cells / RbF-PDT / defects / DLTS / passivation
© T. Helder et al., Published by EDP Sciences, 2022
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