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Reducing ion migration in methylammonium lead tri-bromide single crystal via lead sulfate passivation

Mahapatra, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1063/5.0005369
  3. Publisher: American Institute of Physics Inc , 2020
  4. Abstract:
  5. Surface passivation of organic-inorganic halide perovskites (OIHPs) is a crucial step to annihilate the surface defects and to control the deteriorated ion migration phenomenon. Here, we study the role of lead sulfate (PbSO4) as an effective passivator in OIHP single crystals (SCs). Using impedance spectroscopy, we evaluate the ion migration and electrical properties of lead sulfate-passivated methylammonium lead tri-bromide (MAPbBr3) SCs. We found that the low-frequency impedance response that is assigned to the ionic motion in the MAPbBr3 SC is strongly affected by the inorganic PbSO4 surface treatment. The activation energy corresponding to the ion migration of MAPbBr3 SC is increased from 0.28 to 0.36 eV after PbSO4 surface treatment. The temperature-dependent I-V hysteresis of the MAPbBr3 SCs upon PbSO4 passivation was also measured. We found that such PbSO4 surface treatment stabilizes the crystal surface and improves the hysteresis properties of the crystals at elevated temperatures. © 2020 Author(s)
  6. Keywords:
  7. Activation energy ; Bromine compounds ; Hysteresis ; Ions ; Lead metallography ; Passivation ; Perovskite ; Single crystals ; Sulfate minerals ; Surface defects ; Surface treatment ; Crystal surfaces ; Elevated temperature ; Hysteresis properties ; Impedance spectroscopy ; Low-frequency impedance ; Organic-inorganic ; Surface passivation ; Temperature dependent ; Lead compounds
  8. Source: Journal of Applied Physics ; Volume 127, Issue 18 , April , 2020
  9. URL: https://aip.scitation.org/doi/abs/10.1063/5.0005369