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DS: Fachverband Dünne Schichten
DS 11: Hybrid and Perovskite Photovoltaics I
(Joint session of CPP, DS and HL, organized by CPP)
DS 11.6: Vortrag
Montag, 7. März 2016, 16:15–16:30, H38
Reversible Laser induced Amplified Spontaneous Emission from Coexisting Tetragonal and Orthorhombic Phases in Hybrid Lead Halide Perovskites — •Fabian Panzer1,2,3, Sebastian Baderschneider2,4, Tanaji Gujar5, Thomas Unger1,2, Heinz Bässler2, Ralf Moos3, Mukundan Thelakkat5, Richard Hildner2,4, and Anna Köhler1,2 — 1Experimental Physics II — 2Bayreuth Institute of Macromolecular Research (BIMF) — 3Department of Functional Materials — 4Experimental Physics IV — 5Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
Organic-inorganic mixed halide perovskites received enormous attention over the last few years due to their outstanding performances when used as absorber material in solar cells or in light emitting devices, while offering the possibility for low cost production, e.g. by solution-processing. Furthermore it is known that most halide perovskite materials can exist in different crystal structures, depending on environmental conditions such as temperature. Here we show that a coexistence of tetragonal and orthorhombic phases within the same crystalline grain can be optically induced into the halide perovskite CH3NH3PbI3 at low temperatures, leading to amplified spontaneous emission simultaneously at two distinct wavelengths. The emission feature associated with the tetragonal phase can be reproducibly written, read-out, and erased at 5 K by choosing appropriate laser fluences or raising the temperature. Finally we show to which extend our findings can be exploited for use as an all optical data storage device.