A Lewis Base-Assisted Passivation Strategy Towards Highly Efficient and Stable Perovskite Solar Cells

Guang Yang, Pingli Qin, Guojia Fang, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

61 Citations (Scopus)


Organo-metal halide hybrid perovskites with mixed cations and halides have become promising photovoltaic materials, showing extraordinary optoelectronic properties and excellent device performance. Herein, an organic semiconducting nonfullerene acceptor (NFA) molecule IT-M is introduced as Lewis base to improve perovskite interfaces. This facile Lewis base-assisted strategy effectively enhances the electronic properties of Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3 thin films, passivates the perovskite surface defects and further boosts the performance of perovskite solar cells. With the reduced surface defects, this approach significantly enhances the charge transport properties and boosts the photogenerated photoluminescence lifetime from 1.46 to 2.20 µs. As a result, the n-i-p planar perovskite solar cell champion efficiency reaches 20.5% with a high FF of 81%. Moreover, the Lewis base molecule IT-M can also passivate the under-coordinated lead ions and enhance the durability of perovskite PbI6 octahedra framework under an ambient environment with thermal stress and humidity. The results provide a simple while highly effective route of fabricating the high performance and stable planar perovskite solar cells.

Original languageEnglish
Article number1800055
JournalSolar RRL
Issue number8
Publication statusPublished - 1 Aug 2018


  • Lewis base
  • nonfullerene acceptor
  • perovskite solar cells
  • surface defects passivation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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