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Dmitry Baranov. Portrait.

Dmitry Baranov

Associate senior lecturer

Dmitry Baranov. Portrait.

Fate of Optical Excitons in FAPbI3 Nanocube Superlattices

Author

  • Alessandra Milloch
  • Umberto Filippi
  • Paolo Franceschini
  • Selene Mor
  • Stefania Pagliara
  • Gabriele Ferrini
  • Franco V. A. Camargo
  • Giulio Cerullo
  • Dmitry Baranov
  • Liberato Manna
  • Claudio Giannetti
Show all

Summary, in English

Understanding the nature of the photoexcitation and ultrafast charge dynamics pathways in organic halide perovskite nanocubes and their aggregation into superlattices is key for potential applications as tunable light emitters, photon-harvesting materials, and light-amplification systems. In this work, we apply two-dimensional coherent electronic spectroscopy (2DES) to track in real time the formation of near-infrared optical excitons and their ultrafast relaxation in CH(NH2)2PbI3 nanocube superlattices. Our results unveil that the coherent ultrafast dynamics is limited by the combination of the inherent short exciton decay time (≃40 fs) and the dephasing due to the coupling with selective optical phonon modes at higher temperatures. On the picosecond time scale, we observe the progressive formation of long-lived localized trap states. The analysis of the temperature dependence of the excitonic intrinsic line width, as extracted by the antidiagonal components of the 2D spectra, unveils a dramatic change of the excitonic coherence time across the cubic to tetragonal structural transition. Our results offer a new way to control and enhance the ultrafast coherent dynamics of photocarrier generation in hybrid halide perovskite synthetic solids.

Department/s

  • Chemical Physics
  • LU Profile Area: Light and Materials
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • NanoLund: Centre for Nanoscience

Publishing year

2024-09-18

Language

English

Pages

3511-3520

Publication/Series

ACS Photonics

Volume

11

Issue

9

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Nano-technology
  • Materials Chemistry
  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • 2D spectroscopy
  • hybrid halide perovskites
  • multiexciton dynamics
  • nanocube superlattices
  • trap states

Status

Published

ISBN/ISSN/Other

  • ISSN: 2330-4022