Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Poster: Hybrid and Perovskite Photovoltaics
CPP 11.14: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Understanding excited state dynamics in hybrid lead halide perovskites by temperature dependent time resolved spectroscopy — •Marius Jakoby1, Thomas Unger1,2, Fabian Panzer1,2,3, Tanaji Gujar4, Mukundan Thelakkat4, and Anna Köhler1,2 — 1Experimental Physics II — 2Bayreuth Institute of Macromolecular Research (BIMF) — 3Department of functional Materials — 4Applied functional Polymers, Macromolecular Chemistry, University of Bayreuth, 95440 Bayreuth, Germany
Within the last few years, hybrid lead halide perovskites have emerged as highly attractive active layers in solar cells and in light emitting devices. Here remarkably long charge carrier diffusion lengths in the range of several micrometers combined with the typically low binding energies of excited states are important material properties, which lead to high device efficiencies. Despite these high device efficiencies that were reported, there is still a lack in fundamental understanding the excited state dynamics of this class of material. For instance, there is still no clear consensus about the physical origin of additional emission features that are often observed at low temperature. To identify and characterise the dynamics of these different excited states we performed temperature dependent time resolved emission spectroscopy on different hybrid lead halide perovskite samples using a Streak-Camera setup. The results enable us to identify the nature of the different excited states and explore to which extend the morphology of the material controls their excited states dynamics.