Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Perovskite and Photovoltaics 1 (joint session HL/CPP/KFM)

KFM 4.2: Vortrag

Montag, 5. September 2022, 09:45–10:00, H34

Photon-echo spectroscopy of a CH3NH3PbI3 perovskite single crystal — •Stefan Grisard1, Artur V. Trifonov1,2, Aleksandr N. Kosarev1,3, Ilya A. Akimov1,3, Dmitrii R. Yakovlev1,3, Julian Höcker4, Vladimir Dyakonov4, and Manfred Bayer1,31Experimentelle Physik 2, Technische Universität Dortmund — 2Spin Optics Laboratory, St. Petersburg State University, Russia — 3St. Petersburg, Russia — 4Experimental Physics 6, Julius-Maximilian University of Würzburg

Lead halide perovskites such as CH3NH3PbI3 (MAPbI3) show outstanding characteristics important for photovoltaic and optoelectronic applications. However, the peculiarities of light-matter interactions in these materials are far from being fully explored. Here, we applied time-resolved photon echo spectroscopy to a high quality MAPbI3 single crystal highlighting the importance of inhomogeneous broadening of excitonic transitions even at cryogenic temperatures. Furthermore, we developed an experimental photon-echo polarimetry method that unambiguously identifies contributions from exciton and biexciton to the coherent optical response. Most importantly, our method allows to accurately extract the biexciton binding energy of 2.4meV, even though the period of the observed quantum beats exceeds the coherence times of exciton and biexciton.

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