Narrow-bandgap mixed lead/tin-based 2D Dion-Jacobson perovskites boost the performance of solar cells

Weijun Ke, Cong Chen, Ioannis Spanopoulos, Lingling Mao, Ido Hadar, Xiaotong Li, Justin M. Hoffman, Zhaoning Song, Yanfa Yan*, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

102 Scopus citations


The advent of the two-dimensional (2D) family of halide perovskites and their demonstration in 2D/three-dimensional (3D) hierarchical film structures broke new ground toward high device performance and good stability. The 2D Dion-Jacobson (DJ) phase halide perovskites are especially attractive in solar cells because of their superior charge transport properties. Here, we report on 2D DJ phase perovskites using a 3-(aminomethyl)piperidinium (3AMP) organic spacer for the fabrication of mixed Pb/Sn-based perovskites, exhibiting a narrow bandgap of 1.27 eV and a long carrier lifetime of 657.7 ns. Consequently, solar cells employing mixed 2D DJ 3AMP-based and 3D MA0.5FA0.5Pb0.5Sn0.5I3 (MA = methylammonium, FA = formamidinium) perovskite composites as light absorbers achieve enhanced efficiency and stability, giving a power conversion efficiency of 20.09% with a high open-circuit voltage of 0.88 V, a fill factor of 79.74%, and a short-circuit current density of 28.63 mA cm-2. The results provide an effective strategy to improve the performance of single-junction narrow-bandgap solar cells and, potentially, to give a highly efficient alternative to bottom solar cells in tandem devices.

Original languageAmerican English
Pages (from-to)15049-15057
Number of pages9
JournalJournal of the American Chemical Society
Issue number35
StatePublished - 2 Sep 2020
Externally publishedYes

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Copyright © 2020 American Chemical Society.


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