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- Cinquanta, Eugenio, et al.
(författare)
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Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites
- 2019
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Ingår i: Physical Review Letters. - 0031-9007. ; 122:16
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Tidskriftsartikel (refereegranskat)abstract
- We study the nature of photoexcited charge carriers in CsPbBr3 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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