SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Hybrid and Perovskite Photovoltaics III
CPP 51.8: Vortrag
Donnerstag, 30. März 2023, 17:00–17:15, GÖR 226
An alternative non-invasive technique for studying hybrid perovskite solar cells' in-situ degradation — •Chikezie Williams Ugokwe1,2, Zekarias Teklu Gebremichael1,2, 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 — 2Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany
The main obstacle to the commercialization of hybrid organic-inorganic perovskite (HOIP) solar cells is stability. Hence understanding degradation routes within the solar cell is essential. Traditional characterization methods have so far either monitored global properties, which precludes a better knowledge of local degradation processes, or induced some type of degradation, which conflates results in in-situ degradation studies of perovskite solar cells. In this paper, we describe a non-invasive technique for the in-situ analysis of the degradation of the active layer of an inverted HOIP solar cell. Utilizing the phenomenon of coherent light propagation in thin film layer stacks, we were able to see lead (II)iodide formation over time in a fully functional perovskite solar cell, which is an undeniable by-product of degradation. We were able to quantify the vertical distribution of the degradation product along the thickness of the active layer by using the measured reflectance of the entire solar cell as the input data for the optical modeling.