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Many-Exciton Quantum Dynamics in a Ruddlesden-Popper Tin Iodide.

Esteban Rojas-Gatjens1,2, Hao Li3, Alejandro Vega-Flick1

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, United States.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|November 8, 2023
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Summary
This summary is machine-generated.

Tin halide (PEA)2SnI4 exhibits significantly stronger exciton-exciton interactions and localization than its lead counterpart, impacting quantum dynamics. This difference is linked to lattice disorder in tin-based Ruddlesden-Popper metal halides.

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Area of Science:

  • Materials Science
  • Quantum Optics
  • Solid-State Physics

Background:

  • Ruddlesden-Popper metal halides (RPMHs) are promising optoelectronic materials.
  • Understanding exciton dynamics is crucial for their application.
  • Previous studies highlighted differences between lead and tin-based RPMHs.

Purpose of the Study:

  • To investigate many-body exciton interactions in (PEA)2SnI4.
  • To compare exciton dynamics in tin-based vs. lead-based RPMHs.
  • To elucidate the role of lattice disorder and exciton-exciton interactions.

Main Methods:

  • Coherent two-dimensional electronic spectroscopy (2D ES).
  • Analysis of optical dephasing times and excitation-induced dephasing (EID).
  • Modeling lineshapes using stochastic scattering theory.

Main Results:

  • Observed significantly higher EID rates in (PEA)2SnI4 compared to (PEA)2PbI4.
  • Evidence of exciton localization due to a more disordered lattice in the tin halide.
  • Detection of a low-binding-energy biexcitonic state in (PEA)2SnI4.

Conclusions:

  • Tin-based RPMHs exhibit distinct exciton quantum dynamics from lead-based counterparts.
  • Exciton-exciton interaction strength and static lattice disorder are key differentiating factors.
  • Findings provide insights into the fundamental properties of tin-based RPMHs.