Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.49: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Operando study of light and moisture induced degradation of perovskite solar cell — •Kun Sun1, Julian E. Heger1, Manuel A. Reus1, Xinyu Jiang1, Lukas V. Spanier1, Sigrid Bernstorff2, and Peter Müller-Buschbaum1,3 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2Elettra-Sincrotrone Trieste, 34149 Basovizza — 3MLZ, TU München, 85748 Garching
Perovskite solar cells (PSCs) are among the most promising photovoltaic technologies and reached a certified 25.5% efficiency owing to their tuneable bandgap, high charge carrier mobility, long diffusion length and so on. The long-term operational stability of PSCs, however, has been not investigated. Herein, we probe the structure change with grazing-incidence small-angle scattering and solar cell performance under 1-sun illumination and high humidity. We find that PSCs fabricated with and without caesium iodide (CsI) show differences in the device degradation and morphology change. The decrease of open-circuit voltage (VOC) can be attributed to the morphology changes and the evolution of crystallize grain size. With the additive of CsI, solar cells show slow decay of VOC, correlated to improved morphology of active layer and passivation of trap states. Our work presents a crucial step towards a fundamental understanding of morphology change combined with solar cell parameters during the device operation.