Organic cation – polystyrene sulfonate polyelectrolytes as hole transporting interfacial layers in perovskite solar cells

Yeasin Khan, Yohan Ahn, Ju Hwan Kang, Azmat Ali, Yu Jung Park, Bright Walker, Jung Hwa Seo

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Interfacial layers are important tools that can be used to control the band structure and performance of perovskite solar cells, however, relatively few p-type materials are known compared to n-type interfacial materials. In this work, we demonstrate that anionic polystyrene sulfonate (PSS) polyelectrolytes, with organic cations as counter ions, are able to function as p-type interfacial layers in methylammonium lead triiodide (MAPbI3) perovskite solar cells. These polyelectrolytes show interfacial dipole formation resulting in a significant increase in the work function of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and decrease in the Fermi energy of the CH3NH3PbI3 layer (band bending) as evident from x-ray photoelectron spectra (XPS) and ultraviolet photoelectron spectra (UPS) analysis. These effects result in superior electron blocking and hole extracting characteristics at the anode. We show that open circuit voltage, power conversion efficiency and other device parameters can be increased compared to the devices without interfacial layers using these convenient polyelectrolytes.

Original languageEnglish
Article number152826
JournalApplied Surface Science
Volume588
DOIs
StatePublished - 30 Jun 2022

Keywords

  • Electron blocking
  • Electronic band structure
  • Hole transport layer
  • Interfacial layer
  • Perovskite solar cells
  • Polyelectrolytes

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