Mechanisms of LiF Interlayer Enhancements of Perovskite Light-Emitting Diodes

Rafael Quintero-Bermudez, Jeffrey Kirman, Dongxin Ma, Edward H. Sargent*, Rafael Quintero-Torres

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The use of LiF as a thin interlayer between the electron transport layer and cathode has played a pivotal role in remarkable advances in perovskite LEDs (PeLEDs); however, the mechanism behind the effect of LiF remains to be fully understood. Here, we report a combined experimental and computational study, from which we ascribe the benefits of a LiF interlayer to the migration of dissociated Li into the cathode and dissociated F into the anode. Electronic device simulations reveal that the former improves electron injection by lowering the Schottky barrier height, while the latter reduces the barrier width. These reduce turn-on voltage and improve current density and charge balance in LEDs. We fabricate PeLEDs with and without the LiF interlayer and link these materials and electronic phenomena to the device light-current-voltage characteristics. X-ray photoelectron spectroscopy obtained in sputter profiling of PeLEDs corroborates the dissociation of LiF.

Original languageEnglish (US)
Pages (from-to)4213-4220
Number of pages8
JournalJournal of Physical Chemistry Letters
Issue number10
StatePublished - May 21 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


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