Dresden 2020 – wissenschaftliches Programm
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HL 76.4: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG
Lanthanide Doping of the Double Perovskite Cs2AgBiBr6 — •Gioele Conforto1,2, Jonas Horn1, Fabian Schmitz2, Teresa Gatti2, and Derck Schlettwein1 — 1Justus Liebig University Gießen, Institute of Applied Physics — 2Justus Liebig University Gießen, Institute of Physical Chemistry
Studies on inorganic halide perovskite solar cells showed remarkable improvement of the power conversion efficiency in recent years. An alternative to the extensively studied lead perovskites are double perovskites where Pb2+ is replaced by a monovalent and a trivalent cation, e. g. Cs2AgBiBr6. This material is not toxic and very stable. However, it has a large indirect band gap, low charge carrier mobility and weak absorption of visible light that decrease their efficiency. In this work, doping of this double perovskite with lanthanide atoms is studied in order to investigate options to decrease the band gap, improve absorption of visible light and enhance photoluminescence. The material is prepared either by a hydrothermal method in HBr or is used directly from a solution in dimethyl sulfoxide (DMSO). Thin films are deposited by spin-coating the (doped) double perovskite on fluorine doped tin oxide (FTO) or quartz glass substrates. Structure and composition are characterized by XRD, Raman and SEM-EDX analysis. In addition, optical properties are investigated by the use of UV-Vis absorption and photoluminescence spectroscopy. Small amounts of Eu led to the expected changes of the lattice constant but do not substantially change the absorption characteristics.