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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.45: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

Electromodulation Spectroscopy on Organic-Inorganic Perovskite Solar Cells — •Alice Magin1, Fabian Ruf1, Moritz Schultes2, Erik Ahlswede2, Jonas Schwenzer3, Heinz Kalt1, and Michael Hetterich31Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70563 Stuttgart, Germany — 3Light Technology Institute, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

Organic-inorganic perovskites are promising candidates for low-cost solar cells, showing power-conversion efficiencies above 20% [1] and band-gap tunability. Many fundamental material properties of both methylammonium lead iodide and mixed-cation lead mixed-halide compounds have already been studied, e.g. phase transitions [2] and charge-carrier transport [3]. We investigate the electronic structure of solution-processed perovskite solar cells using temperature-dependent electromodulation spectroscopy in order to determine the energetic position of optical transitions. The temperature dependence reflects the phase transition from the orthorhombic to the tetragonal phase. Comparison with absorption measurements allows estimating the nature of the observed resonances. [1] M. A. Green et al., Prog. Photovolt: Res. Appl. 2017, 25:3-13. [2] A. Poglitsch et al., J. Chem. Phys. 87, 6373 (1987). [3] I. Grill et al., ACS Appl. Mater. Interfaces, 2017, 9 (43), pp 37655-37661.

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