Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound

Xin Wu, Lu Zhang, Zhuo Xu, Selina Olthof, Xiaodong Ren, Yucheng Liu, Dong Yang, Fei Gao, Shengzhong Liu

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19%viathe EPC passivation and the devices show reduced hysteresis and increased stability.

Original languageEnglish (US)
Pages (from-to)8313-8322
Number of pages10
JournalJournal of Materials Chemistry A
Issue number17
StatePublished - May 7 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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