Diffusion and photon recycling in halide perovskite thin films: Insights from experiment and theory

A. Sridharan, Nakita K. Noel, Barry P. Rand, Stéphane Kéna-Cohen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hybrid inorganic-organic perovskites stand out as unique photovoltaic materials due to their exceptional optical and electronic properties. Here, we study in-plane carrier diffusion in perovskite thin films via time-resolved imaging of the photoluminescence from a diffraction-limited spot. Fitting to a 3D diffusion model allows extraction of both diffusion and recombination coefficients. Our results show two regimes of carrier diffusion, with a very rapid spreading large D = (0.968 ± 0.003) cm2s-1 observed at short times, within a measurement window of ∼1 ns, and a much smaller D = (7 ± 1) × 10-3 cm2s-1 in a window of 200 ns. To investigate the rapid spreading at short times, we explicitly consider the effect of photon recycling within the plane of the film. We find that photon recycling has a negligible impact on such measurements, with the exception of a small increase in the intensity of the tails of the luminescence spot.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Semiconductor Materials and Interfaces XIX
EditorsChristian Nielsen, Daniel Congreve, Andrew J. Musser
PublisherSPIE
ISBN (Electronic)9781510637344
DOIs
StatePublished - 2020
EventPhysical Chemistry of Semiconductor Materials and Interfaces XIX 2020 - Virtual, Online, United States
Duration: Aug 24 2020Sep 4 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11464
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysical Chemistry of Semiconductor Materials and Interfaces XIX 2020
CountryUnited States
CityVirtual, Online
Period8/24/209/4/20

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Charge Carrier Diffusion
  • Halide Perovskite
  • Photon Recycling
  • Streak Camera Microscopy
  • Time-Resolved Diffusion Measurement

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