articleScienceOct 17, 2013Closed access

Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber

SDSamuel D. StranksGEGiles E. EperonGGGiulia GranciniCMChristopher MenelaouMJMarcelo J. P. Alcocer

University of Oxford · Center for Nano Science and Technology

PubMed
Indexed incrossrefpubmed

Abstract

Organic-inorganic perovskites have shown promise as high-performance absorbers in solar cells, first as a coating on a mesoporous metal oxide scaffold and more recently as a solid layer in planar heterojunction architectures. Here, we report transient absorption and photoluminescence-quenching measurements to determine the electron-hole diffusion lengths, diffusion constants, and lifetimes in mixed halide (CH3NH3PbI(3-x)Cl(x)) and triiodide (CH3NH3PbI3) perovskite absorbers. We found that the diffusion lengths are greater than 1 micrometer in the mixed halide perovskite, which is an order of magnitude greater than the absorption depth. In contrast, the triiodide absorber has electron-hole diffusion lengths of…

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Topics & keywords

Topics
Keywords
  • Triiodide
  • Perovskite (structure)
  • Materials science
  • Trihalide
  • Heterojunction
  • Micrometer
  • Absorption (acoustics)
  • Diffusion
UN Sustainable Development Goals
  • Affordable and clean energy
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