Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Perovskite and Hybrid Photovolatics
HL 18.1: Vortrag
Dienstag, 13. März 2018, 09:30–09:45, EW 203
Temperature-Dependent Electroabsorption Spectroscopy on Organic-Inorganic Perovskite Solar Cells — •Fabian Ruf1, Alice Magin1, Moritz Schultes2, Erik Ahlswede2, Heinz Kalt1, and Michael Hetterich3 — 1Institute 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 halide perovskites have demonstrated their potential as promising candidates for efficient, low-cost solar cells with power-conversion efficiencies surpassing established technologies such as amorphous silicon. However, despite the strong progress made, many fundamental material properties are not yet well understood. We investigate the nature of the optical transition in solution-processed perovskite solar cells utilizing temperature-dependent electroabsorption (EA) spectroscopy. The resulting EA spectra are suitable for a precise determination of the energetic position of optical transitions in the band structure. These results can be correlated with generalized Elliott fits of standard absorption spectra to investigate the nature of the observed resonances. Additional lineshape analysis of the spectra supports the conclusion of an excitonic nature of the resonances. Nevertheless, efficient charge-separation is possible in these devices which is reflected by power-conversion efficiencies up to 11.5 % (stabilized).