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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.33: Poster

Monday, March 27, 2023, 18:00–20:00, P3

Giant Electrostriction in Lead Halide Perovskite MAPbI3 Films as Measured with Double-Modulated Interferometry — •Philipp Ramming1, Marvin Malchau2, Emma Rauland1, Anna Köhler1, and Lothar Kador21Experimental Physics II, University of Bayreuth, Germany — 2Institute of Physics and BIMF, University of Bayreuth, Germany

Hybrid lead halide perovskite semiconductor MAPbI3 and similar materials have attracted much recent interest for photovoltaic devices. Upon application of moderate electrical fields, MAPbI3 exhibits very large electrostriction effects. The thickness variation was measured with high precision using a double-modulation interferometer set-up. Phase modulation of the laser light and mechanical modulation of the interferometric path difference were employed. With field strengths on the order of 100 kV/cm, the relative thickness change of a polycrystalline film of 1 micron thickness can be as large as several per cent. The electrostriction varies with the square of the field strength; it is strongest at very low frequencies below one Hertz and decreases quickly at higher frequencies. The effect is compared to recently published data obtained on perovskite single crystals.

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