Spatial and temporal imaging of long-range charge transport in perovskite thin films by ultrafast microscopy

Zhi Guo, Joseph S. Manser, Yan Wan, Prashant V. Kamat and Libai Huang ()
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Zhi Guo: Radiation Laboratory, University of Notre Dame
Joseph S. Manser: Radiation Laboratory, University of Notre Dame
Yan Wan: Purdue University
Prashant V. Kamat: Radiation Laboratory, University of Notre Dame
Libai Huang: Radiation Laboratory, University of Notre Dame

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Charge carrier diffusion coefficient and length are important physical parameters for semiconducting materials. Long-range carrier diffusion in perovskite thin films has led to remarkable solar cell efficiencies; however, spatial and temporal mechanisms of charge transport remain unclear. Here we present a direct measurement of carrier transport in space and in time by mapping carrier density with simultaneous ultrafast time resolution and ∼50-nm spatial precision in perovskite thin films using transient absorption microscopy. These results directly visualize long-range carrier transport of ∼220 nm in 2 ns for solution-processed polycrystalline CH3NH3PbI3 thin films. Variations of the carrier diffusion coefficient at the μm length scale have been observed with values ranging between 0.05 and 0.08 cm2 s−1. The spatially and temporally resolved measurements reported here underscore the importance of the local morphology and establish an important first step towards discerning the underlying transport properties of perovskite materials.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8471

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DOI: 10.1038/ncomms8471

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