Compositional and Solvent Engineering in Dion–Jacobson 2D Perovskites Boosts Solar Cell Efficiency and Stability

Weijun Ke, Lingling Mao, Constantinos C. Stoumpos, Justin Hoffman, Ioannis Spanopoulos, Aditya D. Mohite, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


Hybrid halide 2D perovskites deserve special attention because they exhibit superior environmental stability compared with their 3D analogs. The closer interlayer distance discovered in 2D Dion–Jacobson (DJ) type of halide perovskites relative to 2D Ruddlesden–Popper (RP) perovskites implies better carrier charge transport and superior performance in solar cells. Here, the structure and properties of 2D DJ perovskites employing 3-(aminomethyl)piperidinium (3AMP 2+ ) as the spacing cation and a mixture of methylammonium (MA + ) and formamidinium (FA + ) cations in the perovskite cages are presented. Using single-crystal X-ray crystallography, it is found that the mixed-cation (3AMP)(MA 0.75 FA 0.25 ) 3 Pb 4 I 13 perovskite has a narrower bandgap, less distorted inorganic framework, and larger PbIPb angles than the single-cation (3AMP)(MA) 3 Pb 4 I 13 . Furthermore, the (3AMP)(MA 0.75 FA 0.25 ) 3 Pb 4 I 13 films made by a solvent-engineering method with a small amount of hydriodic acid have a much better film morphology and crystalline quality and more preferred perpendicular orientation. As a result, the (3AMP)(MA 0.75 FA 0.25 ) 3 Pb 4 I 13 -based solar cells exhibit a champion power conversion efficiency of 12.04% with a high fill factor of 81.04% and a 50% average efficiency improvement compared to the pristine (3AMP)(MA) 3 Pb 4 I 13 cells. Most importantly, the 2D DJ 3AMP-based perovskite films and devices show better air and light stability than the 2D RP butylammonium-based perovskites and their 3D analogs.

Original languageEnglish (US)
Article number1803384
JournalAdvanced Energy Materials
Issue number10
StatePublished - Mar 13 2019


  • Dion Jacobson
  • low dimensionality
  • perovskites
  • solar cells

ASJC Scopus subject areas

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


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