Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 19: Hybrid and Perovskite Photovoltaics I (Joint session of CPP, DS and HL, organized by CPP)

HL 19.6: 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 Panzer^1,2,3, Sebastian Baderschneider^2,4, Tanaji Gujar⁵, Thomas Unger^1,2, Heinz Bässler², Ralf Moos³, Mukundan Thelakkat⁵, Richard Hildner^2,4, and Anna Köhler^1,2 — 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.