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Phase and Interface Stability Issues in Chalcopyrite-Based Thin Film Solar Cells

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Abstract

How stable are Cu(In,Ga)Se2 solar cells? CuInSe2 is known also as an ionic Cu conductor and the Cu-In-Se system has a rich phase diagram. Two stability-related problems are treated from a thermodynamic point of view: -a- Cu migration, -b- phase segregation. We show how Cu migration imparts self-stabilization on the system. Based on recently reported results on the room temperature phase diagram of CuInSe2, we explain why an overlayer of an ordered vacancy compound (OVC) is not to be expected to appear as a separate phase, even though the surface composition corresponds to that of the I-III3V5 OVC compound.

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Acknowledgement

FE and DC thank the Volkswagen Foundation for partial support. JFG thanks the EuroCIS program. We are indebted to Drs. Herberholz and Schock(IPE, Stuttgart) for providing samples and for stimulating discussions.

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Authors and Affiliations

  1. ENSCP, Laboratoire d'Electrochimie, Paris, France

    Jean-Francois Guillemoles

  2. Max-Planck-Institut für Metallforschung, Stuttgart, Germany

    Thomas Haalboom, Tilo Gödecke & Frank Ernst

  3. Dept. of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel, 76100

    David Cahen

Authors
  1. Jean-Francois Guillemoles
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  2. Thomas Haalboom
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  3. Tilo Gödecke
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  4. Frank Ernst
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  5. David Cahen
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Guillemoles, JF., Haalboom, T., Gödecke, T. et al. Phase and Interface Stability Issues in Chalcopyrite-Based Thin Film Solar Cells. MRS Online Proceedings Library 485, 127–132 (1997). https://doi.org/10.1557/PROC-485-127

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  • DOI: https://doi.org/10.1557/PROC-485-127

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