Regensburg 2025 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 16: Perovskite and Photovoltaics II (joint session HL/KFM)
KFM 16.8: Talk
Thursday, March 20, 2025, 11:30–11:45, H13
Effect of a 2D/3D Heterostructure on Contact Formation of the Double Perovskite Cs2AgBiBr6 with Hole Transport Layers Revealed by In-Situ KPFM Growth Studies — •Tim P. Schneider and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen
The application of a 2D perovskite interlayer caused by surface modification with organic amines between the absorber and contact layers is widely known to significantly improve the performance of perovskite solar cells. This has already been approved as well for the lead-free double perovskite absorber Cs2AgBiBr6. To better understand the interaction of the contact layer with the 2D/3D heterostructure, in this work, film growth of Copper Phthalocyanine (CuPc), used as a model hole conductor, onto Cs2AgBiBr6 modified by different 2D phases was investigated and compared to bare Cs2AgBiBr6. Employing solar cell geometry, the morphology and work function were inspected intermittently to the evaporation of CuPc by Kelvin Probe Force Microscopy at different average film thickness. The energy alignment was revealed to be more confined on the 2D/3D heterostructures and the growth of CuPc was improved: a more homogenous growth led to formation of closed films even at early stages of deposition. These changes in growth and energy alignment are accompanied by preferential formation of different crystal phases in the CuPc.
Keywords: 2D-Perovskite; Contact Formation; Double Perovskite; Kelvin-Probe Force Microscopy (KPFM); Lead-free Perovskite