Peculiar bond length dependence in (Ag,Cu)GaSe2 alloys and its impact on the bandgap bowing
Date
2023-11-02
Journal Title
Journal ISSN
Volume Title
Publisher
APL Materials
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.
Description
This article was originally published in APL Materials. The version of record is available at: https://doi.org/10.1063/5.0164407. © Author(s) 2023
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Citation
Hans H. Falk, Stefanie Eckner, Michael Seifert, Konrad Ritter, Sergiu Levcenko, Timo Pfeiffelmann, Edmund Welter, Silvana Botti, William N. Shafarman, Claudia S. Schnohr; Peculiar bond length dependence in (Ag,Cu)GaSe2 alloys and its impact on the bandgap bowing. APL Mater. 1 November 2023; 11 (11): 111105. https://doi.org/10.1063/5.0164407