How spin physics helps to understand the band structure of lead halide perovskites

Erik Kirstein^a

^aExperimentelle Physik 2, Technische Universität Dortmund, Dortmund 44221, Germany

Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM23)

Peyia, Cyprus, 2023 November 13th - 15th

Organizers: Grigorios Itskos, Maksym Kovalenko and Maryna Bodnarchuk

Invited Speaker, Erik Kirstein, presentation 040
DOI: https://doi.org/10.29363/nanoge.emlem.2023.040
Publication date: 18th August 2023

The emerging field of lead halide perovskite semiconductors offers a plethora of promising material compositions for applications. Experimentally exploring the parameter space for all these combinations, especially in view of the increasing number of tandem devices, is challenging. Theoretical models help predict suitable candidates, but require a fundamental understanding of the perovskite band structure. This is where our experimental methods come in. Experimental spin physics helps improve, validate, and support these models and provide insight into the underlying physics. The experimental method uses the optically oriented spin property of resident and photoexcited charge carriers as a probe. The spin reveals the distinct interactions between the charge carriers and its environment and is sensitive to band mixing, which allows, for example, to determine the significance of distant bands as well as to study the effective mass of the charge carriers. The methodological toolkit includes time-resolved pump-probe Kerr spectroscopy, spin-flip Raman scattering, and optical orientation, which we have successfully applied to macroscopic perovskite crystals [4,5], nanocrystals [1,2], and 2D films [3].

References:

[1] Nestoklon, M.O., Kirstein, E., Yakovlev, D.R., Zhukov, E.A., Glazov, M.M., Semina, M.A., Ivchenko, E.L., Kolobkova, E.V., Kuznetsova, M.S., Bayer, M., 2023. Tailoring the Electron and Hole Landé Factors in Lead Halide Perovskite Nanocrystals by Quantum Confinement and Halide Exchange. Nano Lett. 23, 8218–8224.

[2] Kirstein, E., Kopteva, N.E., Yakovlev, D.R., Zhukov, E.A., Kolobkova, E.V., Kuznetsova, M.S., Belykh, V.V., Yugova, I.A., Glazov, M.M., Bayer, M., Greilich, A., 2023. Mode locking of hole spin coherences in CsPb(Cl, Br)3 perovskite nanocrystals. Nat Commun 14, 699.

[3] Kirstein, E., Zhukov, E.A., Yakovlev, D.R., Kopteva, N.E., Harkort, C., Kudlacik, D., Hordiichuk, O., Kovalenko, M.V., Bayer, M., 2023. Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA)2PbI4 Perovskites. Nano Lett. 23, 205–212.

[4] Kirstein, E., Yakovlev, D.R., Glazov, M.M., Zhukov, E.A., Kudlacik, D., Kalitukha, I.V., Sapega, V.F., Dimitriev, G.S., Semina, M.A., Nestoklon, M.O., Ivchenko, E.L., Kopteva, N.E., Dirin, D.N., Nazarenko, O., Kovalenko, M.V., Baumann, A., Höcker, J., Dyakonov, V., Bayer, M., 2022. The Landé factors of electrons and holes in lead halide perovskites: universal dependence on the band gap. Nat Commun 13, 3062.

[5] Kirstein, E., Yakovlev, D.R., Glazov, M.M., Evers, E., Zhukov, E.A., Belykh, V.V., Kopteva, N.E., Kudlacik, D., Nazarenko, O., Dirin, D.N., Kovalenko, M.V., Bayer, M., 2022. Lead-Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites. Advanced Materials 34, 2105263.

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