Nanoscale Photoexcited Carrier Dynamics in Perovskites

Samuel Berweger, Fei Zhang, Bryon Larson, Andrew Ferguson, Axel Palmstrom, Obadiah Reid, Thomas Wallis, Kai Zhu, Joseph Berry, Pavel Kabos, Sanjini Nanayakkara

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations


The optoelectronic properties of lead halide perovskite thin films can be tuned through compositional variations and strain, but the associated nanocrystalline structure makes it difficult to untangle the link between composition, processing conditions, and ultimately material properties and degradation. Here, we study the effect of processing conditions and degradation on the local photoconductivity dynamics in [(CsPbI3)0.05(FAPbI3)0.85(MAPbBr3)0.15] and (FA0.7Cs0.3PbI3) perovskite thin films using temporally and spectrally resolved microwave near-field microscopy with a temporal resolution as high as 5 ns and a spatial resolution better than 50 nm. For the latter FACs formulation, we find a clear effect of the process annealing temperature on film morphology, stability, and spatial photoconductivity distribution. After exposure of samples to ambient conditions and illumination, we find spectral evidence of halide segregation-induced degradation below the instrument resolution limit for the mixed halide formulation, while we find a clear spatially inhomogeneous increase in the carrier lifetime for the FACs formulation annealed at 180 °C.

Original languageAmerican English
Pages (from-to)2388-2395
Number of pages8
JournalJournal of Physical Chemistry Letters
Issue number10
StatePublished - 17 Mar 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-81892


  • carrier dynamics
  • hybrid inorganic-organic perovskite
  • microwave impedance
  • near-field microscopy
  • perovskites


Dive into the research topics of 'Nanoscale Photoexcited Carrier Dynamics in Perovskites'. Together they form a unique fingerprint.

Cite this