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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: French-German Session: 2D Materials, Thin Films and Interfaces I

CPP 12.6: Hauptvortrag

Montag, 9. März 2026, 16:30–17:00, ZEU/0255

Thin-film and interface properties in energy conversion devices unveiled by X-rays — •Marcus Bär — Department Interface Design, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Berlin, Germany — Energy Materials In-Situ Laboratory Berlin, HZB, Berlin, Germany — Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — Department of X-ray Spectroscopy at Interfaces of Thin Films, Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy, Berlin, Germany

This invited talk will present recent advances in the characterization of the chemical and electronic structure of interfaces and thin films that are central to modern energy-conversion technologies. A combination of X-ray spectroscopies enables non-destructive, depth-resolved insight into composition, chemical structure as well as bonding and energy-level landscapes across complex and often (deeply) buried interfaces. Interfacial intermixing, interlayer formation, oxidation processes, and energy-level alignment govern charge transport and recombination in energy conversion materials and devices. Illustrative case studies will be used to demonstrate how changes (e.g., in the thin-film deposition process) affect interfacial chemistry and electronic structure, highlighting the importance of the ability to probe interface properties as a prerequisite for deliberate interface design. In addition, the talk will outline recent progress in establishing dedicated sample environments allowing for in-situ and operando studies opening new pathways for understanding dynamic interface phenomena.

Keywords: X-ray spectroscopy; solar cells; energy conversion devices; in-situ and operando