Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.25: Poster

Monday, April 1, 2019, 17:30–19:30, Poster B1

A new wafer scale deposition concept for 2D photoactive Bismuth/Bismuth(hydr)oxide multilayers for energy harvesting and environmental sensors — •Sebastian Runde, Christian von Savigny, and Christiane A. Helm — Institute of Physics, Universität Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald

We present a transparent and photoactive multilayer consisting of ultrathin Bismut/Bismuth(hydr)oxide (Bi/BiOxHy) layers, prepared on glass substrates by induced break-up after forced wetting. A 3 nm thick monolayer is electrically isolating, transparent and laterally homogeneous. Multilayers are photoactive. The electric conductivity increases spontaneously with light intensity, it depends weakly on temperature and relative humidity. Thus, the sheet resistance can be tuned between 10 and 350 kΩ. To test long-term stability, the electric conductivity of the multilayer was measured in dependence of the local solar radiation. Fast-Fourier-Transformation of this time dependent sheet resistance shows a dominating cycle duration of ca. 24h.