Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.18: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Cs2AgBiBrxI1−x: A Novel Lead-Free Material for Perovskite Solar Cells — •Melina Armer1, Mathias Fischer1, Liudmila Kudriashova1, Andreas Baumann2, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
As conventional perovskite solar cells contain lead and therefore suffer toxicity issues, finding alternative lead-free materials for the application in perovskite photovoltaics has become an essential problem to be solved. In this work, we present a novel lead-free material for solar cells, Cs2AgBiBrxI1−x, permitting straightforward spin-coating from solution. The films have been characterized using steady state and time-resolved optical spectroscopy. The morphology and quality of the as prepared films has been evaluated using a scanning electron microscope and X-ray Diffraction. It has been found that solution processed Cs2AgBiBrxI1−x forms polycrystalline thin films with crystalline domains in the micrometer range. Further, we observed photoluminescence in the visible region (around 658 nm) with long lifetimes up to 1,6 µs in the visible region by steady state and time resolved photoluminescence measurements. Due to the encouraging optical properties, the straightforward solution processing and its uniform polycrystalline morphology we propose Cs2AgBiBrxI1−x to be a promising candidate for the application in lead-free perovskite solar cells.