Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites

Eugenio Cinquanta; Daniele Meggiolaro; Silvia G. Motti; Marina Gandini; Marcelo J.P. Alcocer; Quinten A. Akkerman; Caterina Vozzi; Liberato Manna; Filippo De Angelis; Annamaria Petrozza; Salvatore Stagira

doi:10.1103/PhysRevLett.122.166601

Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites

Eugenio Cinquanta, Daniele Meggiolaro, Silvia G. Motti, Marina Gandini, Marcelo J.P. Alcocer, Quinten A. Akkerman, Caterina Vozzi, Liberato Manna, Filippo De Angelis, Annamaria Petrozza, Salvatore Stagira

Solid State Physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	166601
Journal	Physical Review Letters
Volume	122
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.122.166601
Publication status	Published - 2019

Subject classification (UKÄ)

Condensed Matter Physics (including Material Physics, Nano Physics)

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10.1103/PhysRevLett.122.166601

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title = "Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites",

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.",

author = "Eugenio Cinquanta and Daniele Meggiolaro and Motti, {Silvia G.} and Marina Gandini and Alcocer, {Marcelo J.P.} and Akkerman, {Quinten A.} and Caterina Vozzi and Liberato Manna and {De Angelis}, Filippo and Annamaria Petrozza and Salvatore Stagira",

year = "2019",

doi = "10.1103/PhysRevLett.122.166601",

language = "English",

volume = "122",

journal = "Physical Review Letters",

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AU - Cinquanta, Eugenio

AU - Meggiolaro, Daniele

AU - Motti, Silvia G.

AU - Gandini, Marina

AU - Alcocer, Marcelo J.P.

AU - Akkerman, Quinten A.

AU - Vozzi, Caterina

AU - Manna, Liberato

AU - De Angelis, Filippo

AU - Petrozza, Annamaria

AU - Stagira, Salvatore

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.122.166601

DO - 10.1103/PhysRevLett.122.166601

M3 - Article

C2 - 31075027

AN - SCOPUS:85065149531

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 166601

ER -

Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites

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