Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 22: Two-dimensional materials III (jointly with HL/TT)
DS 22.1: Vortrag
Dienstag, 21. März 2017, 09:30–09:45, POT 51
Optical properties of organic/inorganic and all-inorganic lead halide perovskite nanoplatelets — •Jasmina A. Sichert1,2, Yu Tong1,2, Verena A. Hintermayr1,2, Alexander F. Richter1,2, Bernhard Bohn1,2, Lakshminarayana Polavarapu1,2, Carlos Cardenas-Daw1,2, Alexander S. Urban1,2, and Jochen Feldmann1,2 — 1Chair for Photonics and Optoelectronics, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität (LMU), Amalienstaße 54, 80799 Munich, Germany — 2Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 Munich Germany
In recent years, organic/inorganic and all-inorganic lead halide perovskite have shown great potential for photovoltaics as well as for light-emitting applications. We have successfully synthesized two-dimensional methylammonium and cesium lead halide perovskite nanoplatelets of varying thickness down to one monolayer.[1,2] With decrease in crystal thickness we observed quantum-size effects and an increase in the exciton binding energy. In the extreme case of a perovskite sheet only a single unit cell thick, the screening of the exciton decreases significantly, resulting in a huge exciton binding energy of several hundred meV in the thin nanoplatelets. We conducted time-resolved photoluminescence spectroscopy to further investigate the effect of the crystal thickness on the optical properties of the nanoplatelets.
[1] Sichert et al., Nano Lett. 15, 6521-6527 (2015)
[2] Tong et al., Angew. Chem. 55, 13887-13892 (2016)