Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Perovskite and Photovoltaics 1 (joint session HL/CPP/KFM)

HL 5.2: Talk

Monday, September 5, 2022, 09:45–10:00, H34

Photon-echo spectroscopy of a CH₃NH₃PbI₃ perovskite single crystal — •Stefan Grisard¹, Artur V. Trifonov^1,2, Aleksandr N. Kosarev^1,3, Ilya A. Akimov^1,3, Dmitrii R. Yakovlev^1,3, Julian Höcker⁴, Vladimir Dyakonov⁴, and Manfred Bayer^1,3 — ¹Experimentelle 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.