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HL: Fachverband Halbleiterphysik
HL 45: Hybrid Perovskite and Photovoltaics I (joint session CPP/HL)
HL 45.6: Vortrag
Mittwoch, 18. März 2020, 10:45–11:00, ZEU 260
Structural, optical and dielectric properties of Cs2AgBiBr6, a lead-free perovskite for photovoltaic applications — •Melina Armer1, Maximilian Sirtl2, Patrick Dörflinger1, Julian Höcker1, Thomas Bein2, and Vladimir Dyakonov1 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Ludwigs Maximilian University München, 81377 München
As conventional perovskite solar cells contain lead and therefore suffer toxicity and stability 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 different solution based approaches, permitting a detailed characterization of the optical and structural properties of this material. The morphology and quality of the as grown crystals has been evaluated using scanning electron microscopy (SEM), energy dispersive X-ray microscopy (EDX) and X-ray diffraction (XRD). The crystals have been characterized using steady-state and time-resolved photoluminescence (PL) spectroscopy. We observed PL in the visible region characterized by large PL lifetimes. Furthermore, the dielectric constant of Cs2AgBiBr6 crystals has been measured at 9 GHz by time resolved microwave conductivity (TRMC). Using the obtained value of the dielectric constant the mobility of Cs2AgBiBr6 thin films could be estimated using TRMC.