articleScienceMay 1, 2015Closed access

Impact of microstructure on local carrier lifetime in perovskite solar cells

DWDane W. de QuilettesSMSarah M. VorpahlSDSamuel D. StranksHNHirokazu NagaokaGEGiles E. Eperon

University of Washington · University of Oxford

PubMed
Indexed incrossrefpubmed

Abstract

The remarkable performance of hybrid perovskite photovoltaics is attributed to their long carrier lifetimes and high photoluminescence (PL) efficiencies. High-quality films are associated with slower PL decays, and it has been claimed that grain boundaries have a negligible impact on performance. We used confocal fluorescence microscopy correlated with scanning electron microscopy to spatially resolve the PL decay dynamics from films of nonstoichiometric organic-inorganic perovskites, CH3NH3PbI3(Cl). The PL intensities and lifetimes varied between different grains in the same film, even for films that exhibited long bulk lifetimes. The grain boundaries were dimmer and exhibited faster nonradiative decay.…

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Topics & keywords

Topics
Keywords
  • Microstructure
  • Perovskite (structure)
  • Materials science
  • Carrier lifetime
  • Optoelectronics
  • Engineering physics
  • Chemistry
  • Composite material
UN Sustainable Development Goals
  • Affordable and clean energy
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