Cu(In,Ga)Se 2 (CIGS) single‐crystal epitaxial films have been analyzed by low energy ion scattering, which is sensitive to exactly the outermost surface atomic layer, to determine the surface chemistry as a function of preparation conditions. The samples were grown by a hybrid sputtering and evaporation method on cation (A) or anion (B) terminated (111) GaAs substrates and had smooth surfaces. The samples were exposed to excited atomic oxygen or hydrogen beams or were sputtered with 500 eV Ar + ions. Atomic O* treatment resulted in an otherwise clean, oxidized surface including all film constituents. Atomic H* resulted in strong enhancement of the surface Ga population, probably due to a preexisting Ga native oxide in the outermost atomic layer. Sputtering produced a clean surface that was closest to the bulk composition of the film as measured by energy‐dispersive spectroscopy. Copyright © 2014 John Wiley & Sons, Ltd. Smooth Cu(In,Ga)Se 2 epitaxial single crystals with metal and Se terminated surfaces were studied by low energy ion scattering. Surface preparation methods were compared. Atomic H was shown to selectively result in a surface devoid of Cu while atomic O and 500 eV ion sputtering leaves a surface with stoichiometry similar to the bulk material. Atomic O also leaves a surface oxide.


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    Titel :

    Low energy ion scattering: surface preparation and analysis of Cu(In,Ga)Se2 for photovoltaic applications



    Erschienen in:

    Erscheinungsdatum :

    2015




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    53.36 Energiedirektumwandler, elektrische Energiespeicher




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