Regensburg 2019 – wissenschaftliches Programm
HL 45.2: Poster
Donnerstag, 4. April 2019, 18:30–21:00, Poster E
Investigation of organic/inorganic lead tribromide perovskite single crystals — •Julian Höcker1, Melina Armer1, Volker Drach1, Vladimir Dyakonov1, and Andreas Baumann2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
Lead halide perovskites (HaPs) are a hot topic in the field of optoelectronic materials due to their unprecedented performance as solution-processed layer, e.g. in photovoltaics and light emitting diodes. Nevertheless, further optimization of HaP solar cell devices is needed, but this requires a deeper understanding of the physical phenomena especially charge carrier transport processes. Here we investigate the fundamental transport mechanism in 3D HaP crystals. The so-called inverse temperature crystallization (ITC) growth technique was used, which is based on the substantial decrease of perovskite solubility, in certain solvents, at elevated temperatures. We focused on three different types of HaP, i.e. organo lead tribromide perovskite single crystals methylammonium lead tribromide (MAPbBr3) and formamidinium lead tribromide (FAPbBr3) comparing to a completely inorganic perovskite crystal caesium lead tribromide (CsPbBr3). The grown crystals are studied by means of powder X-ray diffraction, atomic force microscopy (AFM) and scanning electron microscopy (SEM). The optical properties of the different crystals are characterized by steady-state and transient photoluminescence (PL) and the charge carrier dynamics by Time-of-flight measurements.