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Ultrafast charge carrier dynamics in quantum confined 2D perovskite.
Metadata
Journaljournal of chemical physics2.991Date
2020-Jun-07
Publication Type
Journal Article
Volume
2020-Jun-07 / 152 : 214705
Author
Folpini G 1, Gatto L 2, Cortecchia D 1, Devetta M 2, Crippa G 2, Vozzi C 2, Stagira S 2, Petrozza A 1, Cinquanta E 2
Affiliation
  • 2. Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Milano, Italy.
Doi
PMIDMESH
Abstract
We studied the charge carrier dynamics in 2D perovskite NBT2PbI4 by ultrafast optical pump-THz probe spectroscopy. We observed a few ps long relaxation dynamics that can be ascribed to the band to band carrier recombination, in the absence of any contribution from many-body and trap assisted processes. The transient conductivity spectra show that the polaron dynamics is strongly modulated by the presence of a rich exciton population. The polarization field resulting from the exciton formation acts as the source of a restoring force that localizes polarons. This is revealed by the presence of a negative imaginary conductivity. Our results show that the dynamics of excitons in 2D perovskites at room temperature can be detected by monitoring their effect on the conductivity of the photoinduced polaronic carrier.
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J Chem Physjournal of chemical physics
Metadata
LocationUnited States
FromAMER INST PHYSICS

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