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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.13: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Influence of Ammoniumvaleric Acid on the Current-Voltage Hysteresis of MAPbI3 Thin Films on Microstructured Electrode Arrays — •Jonas Glaser, Jonas Horn, Raffael Ruess, and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik

As organic-inorganic lead halide perovskite solar cells have emerged as promising technology for low-cost and highly efficient photovoltaics, issues such as long term stability and hysteresis in the current-voltage characteristics are put into focus of interest. Microstructured metal electrode arrays can be used to investigate electrical and interface properties of such semiconducting layers. In this work, thin films of methylammonium lead iodide (MAPbI3) were prepared on microstructured platinum arrays in order to study the I-V-characteristics under different applied voltages. Partial substitution of methylammonium by ammoniumvaleric acid was found to reduce the observed hysteresis and, also, decreased the measured current densities by about one order of magnitude. It was found that the appearance of the hysteresis strongly depends on the chosen measurement conditions, e. g., scan rate and voltage range. Therefore, we assume that the application of an external electric field leads to alignment of dipoles and migration of ions and vacancies in the perovskite thin films, which then shows two kinds of I-V-hysteresis, one for smaller voltages that is not influenced by the scan rate and another one for larger applied electric fields whose extent depends on the scan rate.

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