Thiocyanate-Mediated Dimensionality Transformation of Low-Dimensional Perovskites for Photovoltaics

Li Hong, Zaiwei Wang, Jovana V. Milić, Claudia E. Avalos, Weihua Zhang, Dan Ren, Cheng Wang, Brian Carlsen, Yuhang Liu, Shaik Mohammed Zakeeruddin, Anders Hagfeldt, Ti Wang, Hongwei Han, Michael Graetzel

Research output: Contribution to journalArticlepeer-review


Two-dimensional (2D) hybrid perovskite solar cells have induced widespread research interest owing to their higher stability as compared to three-dimensional (3D) analogues. The photovoltaic performance, however, is still limited. Here, we report a perovskite film dominated by 3D components that are modulated by formamidinium thiocyanate in the 2D PEA2FA3Pb4I13perovskite composition. We demonstrate that a dimensionality transformation from a 2D/3D to predominantly 3D perovskite phase in the presence of SCN-based treatment enhances the optical absorption in visible and near-infrared regions. As a result, the power conversion efficiency improved 4.5 times with respect to the control to above 14%. The unencapsulated cell exhibited excellent moisture stability during the shelf lifetime measurement over 70 days under ambient conditions.

Original languageEnglish (US)
Pages (from-to)6331-6338
Number of pages8
JournalChemistry of Materials
Issue number14
StatePublished - Jul 26 2022

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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