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TT: Fachverband Tiefe Temperaturen

TT 6: Focus Session: Two-Dimensional Materials I (joint session DS, HL, TT, organized by HL)

TT 6.5: Talk

Monday, March 20, 2017, 10:45–11:00, POT 81

On the Dynamics of Excitons in Perovskite Nanoplatelets — •Alexander F. Richter^1,2, Verena A. Hintermayr^1,2, Florian Ehrat^1,2, Bernhard Bohn^1,2, Thomas Simon^1,2, Lakshminarayana Polavarapu^1,2, Alexander S. Urban^1,2, and Jochen Feldmann^1,2 — ¹Chair of Photonics and Optoelectronics, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München (LMU), Amalienstraße 54, 80799 Munich, Germany — ²Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 Munich, Germany

Organic-inorganic halide perovskites have received great attention in the past few years due to their remarkably high solar energy conversion efficiency. Their functionality is even more widespread showing vast improvements in light-emitting applications, especially in the form of nanocrystals. We have successfully synthesized two-dimensional perovskite nanoplatelets with a controllable thickness down to a single unit cell. This leads to exciton binding energies in the hundred meV range. Here, we present experimental results on the dynamics of excitons in such nanoplatelets. Time-resolved photoluminescence reveals an increased exciton recombination rate with decreasing crystal thickness. In addition, we derive exciton-phonon scattering rates from a linewidth analysis of linear optical spectra. These results are compared to exciton dephasing rates obtained by transient four-wave-mixing experiments.