Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Hybrid and Perovskite Photovoltaics II
CPP 19.7: Vortrag
Dienstag, 2. April 2019, 11:00–11:15, H18
Structural and optical properties of Cs2AgBiBr6, a lead-free perovskite for photovoltaic applications — •Melina Armer1, Julian Höcker1, Liudmila Kudriashova1, Sebastian Hammer1, Kristofer Tvingstedt1, Andreas Baumann2, Jens Pflaum1,2, and Vladimir Dyakonov1 — 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 and stable lead-free materials for the application in perovskite photovoltaics has become an essential problem to be solved. In this work, lead-free Cs2AgBiBr6 single crystals have been synthesized using a solution based approach, permitting a detailed characterization of the optical and structural properties of this material. The single crystals have been characterized using steady-state and time-resolved photoluminescence (PL) spectroscopy. The morphology and quality of the as prepared crystals has been evaluated using scanning electron microscopy and X-ray diffraction. We observed PL in the visible region characterized by large time constants. Furthermore, Cs2AgBiBr6 thin films have been prepared and their optical and structural properties have been investigated, and compared to the corresponding bulk single crystals. Due to the encouraging optical and structural properties Cs2AgBiBr6 is a promising material for the application as absorber layer in lead-free perovskite solar cells.