Berlin 2024 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 22: Perovskite and Photovoltaics II (joint session HL/KFM)

KFM 22.13: Talk

Thursday, March 21, 2024, 12:45–13:00, EW 203

Impact of ion migration on the performance and stability of perovskite-based tandem solar cells — •Sahil Shah and Martin Stolterfoht — Physik weicher Materie, Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany

Mobile ions play a significant role in perovskite photovoltaics, yet their impact on the overall performance and stability of tandem solar cells (TSCs) remains largely unexplored. In this study, we present a comprehensive study that combines an experimental analysis of ionic losses in Si/perovskite and all-perovskite TSCs, drift-diffusion simulations, and sub-cell-selective measurements on all-perovskite TSCs during aging. Our findings demonstrate that mobile ions have a significant influence on the hysteresis of Si/perovskite tandem solar cells at high scan speeds (400 V/s) during current-voltage measurements, as well as on performance degradation due to field screening. Additionally, subcell-dominated measurements reveal more pronounced ionic losses in the wide-bandgap subcell during aging, which we attribute to its tendency for halide segregation. Drift-diffusion simulations fully corroborate the results. Overall, this work provides valuable insights into ionic losses in perovskite solar cells and discloses new opportunities for their optimization toward more efficient and stable perovskite-based tandem cells.

Keywords: perovskite; stability; solar cell; Mobile ions; device