DOI: https://doi.org/10.29363/nanoge.sus-mhp.2022.035
Publication date: 15th November 2022
The coherent spin dynamics in perovskite films:
Advantages of Sn-‐based perovskites against Pb-‐based perovskites.
G. Garcia-Arellano 1 , G. Trippé-Allard 2 , E. Deleporte 2 , F. Bernardot 1 ,
C. Testelin 1 and M. Chamarro 1
1 Sorbonne Université, CNRS, Institut des NanoSciences de Paris, 4 place Jussieu, F-75005
Paris, France
2 Laboratoire LuMin, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay,
91405 Orsay Cedex, France
Hybrid metal-halide perovskites show outstanding optoelectronic properties and are also
highly promising materials in the spintronic domain due to their large and tunable spin-orbit
coupling, spin-dependent optical selection rules, and their predicted electrically tunable
Rashba spin splitting.
In this work, [1,2] we investigated the spin coherence time in a MAPI polycrystalline film by
means of a picosecond pump-probe technique: the photo-induced Faraday rotation (PFR). We
measured long spin coherence times of localized electrons (holes) of 4,4 ns (3,7 ns) at 1.635
eV and about 7 ns at 1.612 eV. We demonstrated that the spin relaxation time observed in the
PFR technique must be attributed to localized electrons and holes, instead of excitons as it
was supposed in previous work [3], due to: a) the long spin relaxation time, b) the linear
dependence on the electron and hole frequencies with the magnetic field confirming the
absence of electron-hole exchange interaction effects c) The possibility of tuning the electron
and hole contributions into the PFR signal by varying the energy of the pump-probe
experiment.
In more conventional semiconductor, like GaAs or CdTe, it has been demonstrated that the
two main mechanisms limiting, at low temperature and in the isolating regime, the value of
the electronic spin relaxation are the hyperfine interaction and the spin-orbit interaction. We
will discuss the consequences of replacing the Pb 2+ by Sn2+ cation on the spin decoherence
and relaxation times.
[1] Garcia-Arellano, G. et al, J. Phys. Chem. Lett. (2021),12, 8272.
[2] Garcia-Arellano, G. et al, Nanomaterials (2022), 12, (9), 1299.
[3] Odenthal, P. et al, Nature Physics (2017), 13, 894.
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