Peculiar bond length dependence in (Ag,Cu)GaSe2 alloys and its impact on the bandgap bowing
Source abstract
Abstract
Contrary to other semiconductor alloys, incorporation of Ag into CuGaSe2 increases the bandgap, even though the lattice expands, and the Ga–Se bond length is theoretically predicted to decrease rather than increase. Herein, we experimentally confirm this peculiar bond length dependence of (Ag,Cu)GaSe2 using x-ray absorption spectroscopy. We further model the different anion displacements and estimate that their combined contribution to the bandgap bowing is close to zero. These findings differ from those for Cu(In,Ga)Se2 and demonstrate the diversity of chalcopyrite alloys and their properties.
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Research context
OpenAlex topics: Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Felix-Bloch-Institut für Festkörperphysik, Universität Leipzig 1 , Linnestraße 5, 04103 Leipzig, Germany
Institut für Festkörpertheorie und-optik, Friedrich-Schiller-Universität Jena 2 , Max-Wien-Platz 1, 07743 Jena, Germany
Deutsches Elektronen-Synchrotron DESY 3 , Notkestraße 85, 22607 Hamburg, Germany
Department of Materials Science & Engineering and Institute of Energy Conversion, University of Delaware 4 , Newark, Delaware 19716, USA
Funding
Deutsche Forschungsgemeinschaft · Leibniz-Rechenzentrum · Deutsches Elektronen-Synchrotron
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