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  Article

  Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation
  

  Author(s):

  R. Scheidt, B. Seger, P. Kamat, Tor Elmelund

  Abstract:

  MAPbBr3 and MAPbI3 films cast onto glass slides and physically paired together undergo halide exchange to form mixed halide films. The change in halide composition in these two ∼130 nm thick films occurs concurrently with Br− diffusing toward the MAPbI3 film and I− diffusing toward the MAPbBr3 film. The diffusion of these halide species, which is tracked through changes in the absorption, offers a direct measurement of thermally activated halide diffusion in perovskite films. The increase in …

  Date Published:

  2019-07

  Record Visibility:

  Public