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HL: Fachverband Halbleiterphysik

HL 4: Perovskite and Photovoltaics I (joint session HL/KFM)

HL 4.8: Vortrag

Montag, 18. März 2024, 11:45–12:00, EW 203

Optical Simulations of Light Management in Ultrathin CIGSe Solar Cells with Nanophotonic Back Contacts — •Daniel Jimenez Tejero, Merve Demir, Thomas Schneider, Bodo Fuhrmann, Roland Scheer, Ralf Wehrspohn, and Alexander Sprafke — Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, 06120 Halle (Saale), Germany

Ultrathin Cu(In,Ga)Se2 (CIGSe) solar cells are in development to decrease material usage and broaden the range of applications. However, CIGSe absorber layers with thicknesses below 1 µm suffer from reduced light absorption, especially for wavelengths near the bandgap, leading to decreased power conversion efficiency. To counteract this, we employ nanostructured functional back contacts to effectively increase the optical path length within the CIGSe absorber layer through nanophotonic mechanisms such as scattering and coupling into thin film modes. The focus lies on CIGSe absorber layers with a thickness of 300 nm to 500 nm deposited on SiO2 nanostructures on a flat aluminium or gold back contact. Our approach employs nano-optical simulations using the finite element method and aims to identify designs with promising photocurrent enhancements feasible for fabrication and to clarify the underlying mechanisms.

Keywords: CIGSe; Light management; Ultra-thin film; Photovoltaics; Nanophotonics