PbI2 Reagent Impurities Catalyze Mixed-Cation Halide Perovskite Ink Degradation

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Non-negligible K, acetate (OAc-), and nitrate (NO3-) impurities have been identified in commercially available PbI2 reagents, plausibly remnant from synthesis. Here, we characterize the individual impact of each of these impurities on the relative rate of the methylammonium (MA) condensation reaction with formamidinium (FA) to release Nmethylformamidinium (MFA), a main degradation pathway of mixed-cation halide perovskite inks, emphasizing the need to better control purity in halide perovskites.

Original languageAmerican English
Pages (from-to)4333-4335
Number of pages3
JournalACS Energy Letters
Issue number12
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 The Author(s).

NREL Publication Number

  • NREL/JA-5900-83900


  • halide perovskite
  • impurities
  • solution degradation


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