Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics II (joint session HL/KFM)
HL 45.1: Talk
Thursday, March 20, 2025, 09:30–09:45, H13
Optical Simulations of Nanophotonic Back Contacts for Light Management in Ultrathin CIGSe Solar Cells — •Daniel Jiménez Tejero1, Merve Demir1, Bodo Fuhrmann2, Roland Scheer1, Ralf Wehrspohn1, and Alexander Sprafke1,2 — 1Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Von-Danckelmann-Platz 3, 06120 Halle (Saale) — 2MLU, Interdisziplinäres Zentrum für Materialwissenschaften, Nanotechnikum Weinberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale)
The development of ultrathin-film Cu(In,Ga)Se2 (CIGSe) solar cells aims to reduce material usage and expand applications such as bifacial or tandem solar cells. However, CIGSe absorber layers with thicknesses below 1 µ m exhibit diminished light absorption, particularly for wavelengths near the bandgap, leading to decreased power conversion efficiency. This can be counteracted by utilising functional back contacts that effectively increase the optical path length within the absorber layer through scattering, reflection, and nanophotonic mechanisms.
This work employs nano-optical simulations to investigate the potential of SiO2 nanostructures on a flat gold back contact for enhancing the performance of CIGSe solar cells. By solving the Maxwell equations using the finite element method, the quantum efficiency and photocurrent under ideal charge carrier collection conditions are computed, enabling a comparison of various nanostructure geometries viable for fabrication. We find photocurrents higher than those of conventional CIGSe solar cells with an absorber thickness of 4 µ m, indicating the potential of our light management approach.
Keywords: Thin-film solar cells; Light management; Nanophotonics; Finite element method; JCMsuite