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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics V
CPP 44.4: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, ZEU/LICH
In-Situ KPFM Growth Studies of Pentacene as a Model Hole Transport Material on 2D/3D Heterostructured Cs2AgBiBr6 for Perovskite Solar Cells — •Tim P. Schneider and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen
Forming low-dimensional perovskite interlayers in perovskite solar cells by applying ammonium salt solutions is a well-known method to improve devices. This has already been approved for the Cs2AgBiBr6 double perovskite in solar cell geometry by a 2D-modification with BABr or PEABr salts achieving respective low-dimensional phases at the interface. Using pentacene as a model hole conductor, its film growth and contact formation to the different double perovskite phases was investigated via in-situ growth studies using Kelvin Probe force microscopy (KPFM). Measuring the morphology and work function at intermittent steps during film deposition allowed to observe their evolution depending on the average pentacene film thickness. Image processing of the resulting KPFM images facilitated to assign different morphological features (from substrate or pentacene) present in the height images to different contributions to the work function and, especially, clearly identified the pentacene grains within other similar morphological features. A much more homogenous growth of pentacene on 2D/3D heterostructured Cs2AgBiBr6 was observed, forming evenly shaped grains or dendritic islands. This was further accompanied by a more confined work function, speaking for an enhanced contact alignment between the double perovskite and pentacene.
Keywords: atomic force microscopy (AFM); organic semiconductor; lead free perovskite; 2D perovskite; Ruddlesden-Popper phases