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Open Access Publications from the University of California

Quantitative imaging of anion exchange kinetics in halide perovskites.

  • Author(s): Zhang, Ye;
  • Lu, Dylan;
  • Gao, Mengyu;
  • Lai, Minliang;
  • Lin, Jia;
  • Lei, Teng;
  • Lin, Zhenni;
  • Quan, Li Na;
  • Yang, Peidong
  • et al.

Ion exchange, as a postsynthetic transformation strategy, offers more flexibilities in controlling material compositions and structures beyond direct synthetic methodology. Observation of such transformation kinetics on the single-particle level with rich spatial and spectroscopic information has never been achieved. We report the quantitative imaging of anion exchange kinetics in individual single-crystalline halide perovskite nanoplates using confocal photoluminescence microscopy. We have systematically observed a symmetrical anion exchange pathway on the nanoplates with dependence on reaction time and plate thickness, which is governed by the crystal structure and the diffusion-limited transformation mechanism. Based on a reaction-diffusion model, the halide diffusion coefficient was estimated to be on the order of [Formula: see text] This diffusion-controlled mechanism leads to the formation of 2D perovskite heterostructures with spatially resolved coherent interface through the precisely controlled anion exchange reaction, offering a design protocol for tailoring functionalities of semiconductors at the nano-/microscale.

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