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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.7: Poster

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

The 2-Step deposition method of mixed perovskites as a route to highly tunable optoelectronic properties — •Lennart Reb and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany

Mixed-cation lead mixed-halide perovskite solar cells with their impressive increase in efficiency over the last years, exceeding 22 per cent recently, are promising to play a role for future and sustainable power generation. Typically, the well-established 1-step spin-coating deposition technique is used for the perovskite layer to achieve these high efficiencies. In contrast, the 2-step deposition technique takes full advantage of the chemical tuneability of the perovskite semi-conductors. Probing such perovskite thin films of different chemical compositions and concentrations with grazing incidence small- and especially wide-angle X-ray scattering allows assessing their morphological and crystalline structure. Spectroscopic measurements, e.g. ellipsometry, external quantum efficiency measurements, impedance spectroscopy, complement the structural investigations and thereby help us to increase our knowledge of some still poorly understood physical mechanisms in perovskite solar cells. More importantly, this is a necessary step to be able to tune the fascinating optoelectronic properties of perovskite to access the full range of other promising applications, such as photo-detectors and light emitting diodes.

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