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About Carrier's Self-Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA)2(MA)2Pb3l10
Weiyan Qi1, Stefano Ponzoni1, Guénolé Huitric1
1Laboratoire des Solides Irradiés, CEA/DRF/lRAMIS, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
None:
Time- and Angle-Resolved Photoelectron Spectroscopy (tr-ARPES) is employed to monitor photoexcited electrons in the 2D hybrid perovskite (BA) (MA) . Photoelectron intensity maps are in good agreement with ab-initio calculations of the band structure. The effective mass is and for holes and electrons, respectively. In the photoexcited state, spin-orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to eVÅ. The correlated electron-hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self-trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.
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