Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 34: Focus Session: Perspectives in Cu(In,Ga)Se 2
HL 34.5: Hauptvortrag
Donnerstag, 8. September 2022, 17:00–17:30, H33
Digital Twins - a simulation model for Cu(In,Ga)Se2 solar cells of high and moderate efficiency — •Matthias Maiberg1, Chang-Yun Song1, Marcin Morawski1, Felix Neduck1, Joshua Damm1, Heiko Kempa1, Dimitrios Harisko2, Wolfram Witte2, and Roland Scheer1 — 1Institute of Physics, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 3, 06120 Halle (Saale), Germany — 2Zentrum für Sonnenenergie- und Wasserstoffforschung Baden-Württemberg, Meitnerstraße 1, 70563 Stuttgart, Germany
To overcome the current record efficiency of Cu(In,Ga)Se2 (CIGSe) solar cells, loss mechanisms need to be identified through comprehensive device models. The development of such models, however, is hampered by the complex film microstructure of CIGSe as well as its multi-component device structure. In the first part of our talk, we present one-dimensional models for CIGSe solar cells with high efficiency at around 19 % and moderate efficiency at around 16 %. These models have been obtained by a fitting routine for a set of experimental data which calls the simulation tool Synopsys TCAD as the subprogram. As an outcome, we obtain material parameters of CIGSe. The minority carrier lifetime, for example, exhibits values of >15 ns in the highly efficient cells while it is only 3 ns in the moderately efficient device. In the second part of our talk, we use such digital twin in order to identify loss mechanisms in the solar cells. Here, we address the non-radiative recombination as origin of electronic losses as well as the band gap grading and the window layers as origins for optical losses.