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Scanning Photocurrent Microscopy in Single Crystal Multidimensional Hybrid Lead Bromide Perovskites.

Elena Segura-Sanchis1, Rocío García-Aboal1, Roberto Fenollosa1

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|September 28, 2023
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Summary

We studied hybrid perovskite crystals, finding that multidimensional 2D-3D materials show simpler charge carrier dynamics than 3D perovskites. This difference is linked to border effects and exciton binding energy, impacting device performance.

Keywords:
SPCMdiffusion lengthdynamicmultidimensionalperovskitesingle crystal

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photovoltaics

Background:

  • Hybrid perovskites are promising for optoelectronic applications.
  • Understanding charge carrier dynamics is crucial for device efficiency.

Purpose of the Study:

  • To compare charge carrier dynamics in multidimensional 2D-3D hybrid lead bromide perovskites and 3D perovskites.
  • To investigate the role of crystal boundaries and exciton binding energy.

Main Methods:

  • Spatially resolved photocurrent and photoluminescence measurements.
  • Scanning photocurrent microscopy (SPCM) with dip probe and back contacts.
  • Biased detection analysis of photocarrier decay length and spatial dynamics.

Main Results:

  • Multidimensional 2D-3D perovskites exhibited a single exponential decay model for photocarriers.
  • 3D perovskites showed two distinct dynamics (fast and slow), with slow decay two orders of magnitude larger.
  • Photocurrent decay length decreased with proximity to crystal borders, indicating border recombination centers.

Conclusions:

  • Multidimensional 2D-3D perovskites possess more favorable charge transport properties than 3D perovskites.
  • Interlayer screening and higher exciton binding energy in 2D-3D materials contribute to their distinct dynamics.
  • Border recombination significantly impacts charge carrier migration in monocrystalline perovskite samples.