Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites
Eugenio Cinquanta(Istituto di Fotonica e Nanotecnologie), Daniele Meggiolaro(Italian Institute of Technology), Silvia G. Motti(Center for Nano Science and Technology), Marina Gandini(Center for Nano Science and Technology), Marcelo J. P. Alcocer(Lund University), Quinten A. Akkerman(Italian Institute of Technology), C. Vozzi(Istituto di Fotonica e Nanotecnologie), Liberato Manna(Italian Institute of Technology), Filippo De Angelis(Italian Institute of Technology), Annamaria Petrozza(Center for Nano Science and Technology), S. Stagira(Politecnico di Milano)
Cited by 136Open Access
Abstract
We study the nature of photoexcited charge carriers in CsPbBr_{3} nanocrystal thin films by ultrafast optical pump-THz probe spectroscopy. We observe a deviation from a pure Drude dispersion of the THz dielectric response that is ascribed to the polaronic nature of carriers; a transient blueshift of observed phonon frequencies is indicative of the coupling between photogenerated charges and stretching-bending modes of the deformed inorganic sublattice, as confirmed by DFT calculations.
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