Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.50: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Non-invasive characterization of degradation in inverted planar perovskite solar cells via reflectance and optical modelling. — •Chikezie Williams Ugokwe1,2, Kehinde Ogunmoye1,2, Ulrich S. Schubert1,2, and Harald Hoppe1,2 — 1Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany — 2Institute for Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany
Despite gains in efficiency since their discovery a little more than a decade ago, hybrid perovskite solar cells (PSCs) are still plagued by poor stability. This poor stability also interferes with their characterization to the point where widely used and easily applicable methods of studying in situ degradation, such as scanning electron microscopy, X-ray diffraction, impact the result because they are invasive and introduce some forms of degradation themselves.
We pursued a non-invasive approach for characterizing the evolution of degradation in PSCs using a combination of optical characterization, modelling, and simulation. Using a software package for coherent light propagation in thin film layer stacks, reflectance and transmittance spectra were used to model the complex refractive index of each functional layer. The evolution of degradation was then studied for ageing methylammonium PSC using periodically measured reflectance data. We will discuss if the evolution of lead iodide, the undoubtable by-product of degradation can be detected using optical simulation.