Mechanisms of LiF Interlayer Enhancements of Perovskite Light-Emitting Diodes

• DOI: 10.1021/acs.jpclett.0c00757
• Publication Date: 2020-05-06T17:51:29Z
• Authors: Rafael Quintero-B...; Jeffrey Kirman; Dongxin Ma; Edward H. Sargent; Rafael Quintero-T...
• Keywords: 02 engineering and technology; 0210 nano-technology

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