Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 78: Hybrid and Perovskite Photovoltaics II
CPP 78.2: Vortrag
Freitag, 16. März 2018, 09:45–10:00, C 264
Characterization and phase identification in cesium lead bromide thin films by correlative scanning electron microscopy — •Sebastián Caicedo-Dávila1, Hannah Funk1, Christian Müller2, Michael Sendner3, Robert Lovrincic2, and Daniel Abou-Ras1 — 1Helmholtz Zentrum Berlin for Materials and Energy, Berlin, Germany — 2Institute for High-Frequency Technology, InnovationLab, TU Braunschweig, Heidelberg, Germany — 3Kirchhoff Institute of Physics, Heidelberg University, Heidelberg, Germany
Designing high-efficiency solar cells based on wide-gap, halide-perovskite absorbers is challenging, and understanding what limits the performance of such devices is still an open issue in the field. One of the wide-gap materials of interest is cesium lead bromide. If deposited as thin film, various Cs-Pb-Br phases may be present. Identification of these phases, their distribution at a microscopic level, as well as the correlation between microscopic, optoelectronic properties with macroscopic materials characteristics are fundamental tasks in research and development. In the present contribution, we report on local compositions and optoelectronic properties of Cs-Pb-Br thin films synthesized by spin-coating and coevaporation, which were analyzed by using SEM imaging, energy-dispersive X-ray spectrometry, cathodoluminescence, XRD, and photoluminescence spectroscopy. We discuss the different phase distribution and its dependence on synthesis method, and microscopic structuring of the film, the challenges concerning specimen preparation for more advanced SEM techniques, and the issue of damaging the sample by the electron beam.