Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.8: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Characterization and Encapsulation of Perovskite Solar Cells — •Benjamin Predeschly, Lennart Reb, and Peter Müller-Buschbaum — TU München, Physik Department, LS Funktionelle Materialien, 85748 Garching, Germany

Perovskite Solar Cells (PSCs) with their upscalable low-cost production from solution and their flexibility, suited for new application fields, are promising for future energy generation. Impressive power conversion efficiency (PCE) of more than 20 percent was reached recently as a result of optimized preparation techniques and material compositions. However, PSCs exposed to ambient conditions, especially humidity, show a decreasing PCE with time, making long-term stability a bottleneck towards commercialization. We process PSCs with the champion architecture and investigate them by various methods like external quantum efficiency measurements, scanning electron microscopy and grazing incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS) to relate the morphological changes to the degradation of the device performance. To improve the long-term stability, we develop a simple but effective method for mechanical encapsulation, protecting the PSC with a flexible foil from humidity. We track the PCE of the encapsulated PSCs over time, with a substantial improvement of the long-term stabilization in ambient condition, which is supported by GIWAXS measurements. Reaching long-term stability for PSCs is an important step towards their success.