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Effect of 6R and 12R lead iodide polytypes on MAPbI3 perovskite device performance

  • T. D. Malevu
  • B. S. Mwankemwa
  • K. G. Tshabalala
  • M. Diale
  • R. O. Ocaya
Article
  • 64 Downloads

Abstract

We compare the structural, morphological and electrical properties of two variants of the ITO/ZnO/\(\hbox {CH}_3\hbox {NH}_3\hbox {PbI}_3\)/PDOT:PSS/Au thin film perovskite device made using two structurally different forms of lead iodide. The first device was based on a commercially sourced, common 12R polytype. The second device uses the rarer 6R polytype, as recently synthesized by the authors from depleted sealed lead acid batteries. XRD measurements confirmed the presence of the orthorhombic 6R polytype and the tetragonal 12R polytype. Raman spectroscopy confirmed the presence of all organic–inorganic halide materials. Current–voltage measurements for both samples show good rectifying behavior of the resulting heterogeneous Schottky diodes. The ideality factors and barrier heights were found to be 4.07/4.09 and 0.500/0.496 eV for the 6R/12R polytypes, respectively. The 6R polytype devices appeared to show improved I–V characteristics in comparison to the 12R polytype, thus suggesting an avenue to enhance the performance of MAPbX3 prevoskite devices.

Notes

Acknowledgements

The authors wish to thank the National Research Foundation, through the NRF-DST Innovation Grant No. 94944, and the University of the Free State for financial support.

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Authors and Affiliations

  1. 1.School of Chemistry and PhysicsUniversity of KwaZulu-NatalDurbanSouth Africa
  2. 2.Department of PhysicsUniversity of PretoriaHatfieldSouth Africa
  3. 3.Department of Physics, School of Physical Sciences, College of Natural and Mathematical SciencesUniversity of DodomaDodomaTanzania
  4. 4.Department of PhysicsUniversity of the Free StatePhuthaditjhabaSouth Africa

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