Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 52: Functional semiconductors for renewable energy solutions II (joint session HL/CPP)

CPP 52.3: Vortrag

Dienstag, 17. März 2020, 14:30–14:45, POT 151

Random structure search: Solving the kesterite-stannite
puzzle in (Cu,Ag)
2ZnSnSe4 solid solution — •Daniel Fritsch1 and Susan Schorr1,21Department Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 2Department of Geosciences, Freie Universität Berlin, Malteserstr. 74−100, 12249 Berlin, Germany

Cu2ZnSnSe4 and Ag2ZnSnSe4 are both crystallising in the kesterite structure with the structurally similar stannite structure being energetically slightly less favourable. In the solid solution, however, there is experimental evidence that for some intermediate concentrations the stannite structure is energetically favoured. This behaviour is so far not understood.

Here, we’re using density functional theory calculations to shed some light into the structure-property relations in (Cu,Ag)2ZnSnSe4. In order to simulate the different concentrations within the solid solution, we’re employing the supercell approach based on the respective end members in the kesterite and stannite structure. The Ag and Cu cations are distributed randomly within the supercell, thereby creating several structure models for the solid solutions for further analysis. All random structure models are geometry optimised employing the recently developed SCAN functional. In order to obtain more reliable electronic and optical properties, selected optimised structures are subjected to single-shot calculations employing the more accurate hybrid functional HSE06.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden