Temperature-Dependent Intensity Modulated Two-Photon Excited Fluorescence Microscopy for High Resolution Mapping of Charge Carrier Dynamics

Qi Shi, Pushpendra Kumar, Tönu Pullerits

Research output: Contribution to journalArticlepeer-review

Abstract

We present a temperature-dependent intensity modulated two-photon excited fluorescence microscopy technique that enables high-resolution quantitative mapping of charge carrier dynamics in perovskite microcrystal film. By disentangling the emission into harmonics of the excitation modulation frequency, we analyze the first and second order charge carrier recombination processes, including potential accumulation effects. Our approach allows for a quantitative comparison of different emission channels at a micrometer resolution. To demonstrate the effectiveness of the method, we applied it to a methylammonium lead bromide perovskite microcrystal film. We investigated the temperature-dependent modulated imaging, encompassing the exciton dissociation-association and charge carrier trapping-detrapping equilibrium. Additionally, we explored the potential freezing out of traps and the phase transition occurring at low temperatures.

Original languageEnglish
Pages (from-to)467-476
Number of pages10
JournalACS Physical Chemistry Au
Volume3
Issue number5
DOIs
Publication statusPublished - 2023 Sept 27

Subject classification (UKÄ)

  • Physical Chemistry

Free keywords

  • first-order recombination
  • intensity modulation technique
  • MAPbBr perovskite
  • phase transition
  • second-order recombination

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