Mitigation of Morphological Defects in Methylammonium-Free Formamidinium-Based Perovskite Solar Cells

Linfeng Cai, Chun Wai Suen, Ying Suet Lau, Zhaojue Lan, Jiayin Han, Furong Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

9 Citations (Scopus)


Operational stability of perovskite solar cells (PSCs) is essential for commercial viability. In this work, we report our efforts to understand the impact of potassium cations on mitigating the morphological defects in the methylammonium-free formamidinium-based perovskite photoactive layer. The addition of potassium cations is favorable for the stable operation of FA0.85Cs0.1K0.05PbI3-based PSCs through retarding the transformation of the intermediate phases. FA0.85Cs0.1K0.05PbI3-based PSCs can retain 96% of the initial power conversion efficiency (PCE) after a 2 month accelerated aging test, whereas more than 40% drop in PCE is observed in FA0.9Cs0.1PbI3-based PSCs during the same aging test. The use of potassium cations provides a practical solution to mitigate the morphological defects in the perovskite layer and thereby enhances the operational stability of the FA0.85Cs0.1K0.05PbI3-based PSCs.

Original languageEnglish
Pages (from-to)8304–8312
Number of pages9
JournalACS Applied Energy Materials
Issue number7
Early online date13 Jul 2022
Publication statusPublished - 25 Jul 2022

Scopus Subject Areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • cation engineering
  • charge collection
  • morphological defects
  • perovskite solar cells
  • stability


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