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HL: Fachverband Halbleiterphysik
HL 1: Perovskite and Photovoltaics I (joint session HL/KFM)
HL 1.6: Vortrag
Montag, 17. März 2025, 10:45–11:00, H13
Minimizing VOC losses in high bandgap perovskite solar cells for the application in perovskite/perovskite/silicon triple-junction solar cells — •Athira Shaji1,2, Minasadat Heydarian1,3, Oliver Fischer1,3, Michael Günthel1, Orestis Karalis4, Maryamsadat Heydarian1, Alexander J. Bett1, Hannes Hempel4, Martin Bivour1, Florian Schindler1, Martin C. Schubert1, Stefan W. Glunz1,3, Andreas W. Bett1,2, Juliane Borchert1,3, and Patricia S. C. Schulze1 — 1Fraunhofer Institute for Solar Energy Systems ISE, Germany — 2University Freiburg, Institute of Physics, Germany — 3University of Freiburg, Department of Sustainable Systems Engineering, Germany — 4Helmholtz-Zentrum Berlin, Solar Energy Division, Germany
The high bandgap (HBG) top cell is the main source of VOC loss in perovskite/perovskite/silicon triple junction solar cells due to photoinduced phase segregation, non-radiative recombination at the perovskite bulk and interface with the charge transport layers (CTLs), as well as energetic misalignment between the perovskite layer and the CTLs. The starting point of this work was a triple-cation double-halide perovskite composition with a bandgap of 1.83 eV. By implementing a multi-faceted optimization approach, an average improvement in VOC of 250 mV was achieved for HBG perovskite solar cells. Replacing the reference HBG perovskite with the optimised top cell in perovskite/perovskite/silicon triple-junction solar cells results in the improvement of VOC by 124 mV, and the champion device achieves a voltage above 3 V.
Keywords: Open circuit voltage loss; High bandgap perovskite; Perovskite-based triple-junction solar cell; Photovoltaics