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Mechanisms of LiF Interlayer Enhancements of Perovskite Light-Emitting Diodes
- Source :
- The Journal of Physical Chemistry Letters. 11:4213-4220
- Publication Year :
- 2020
- Publisher :
- American Chemical Society (ACS), 2020.
-
Abstract
- 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.
- Subjects :
- Electron transport layer
Materials science
business.industry
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Cathode
0104 chemical sciences
law.invention
law
Optoelectronics
General Materials Science
Physical and Theoretical Chemistry
0210 nano-technology
business
Perovskite (structure)
Light-emitting diode
Subjects
Details
- ISSN :
- 19487185
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry Letters
- Accession number :
- edsair.doi.dedup.....6142238c40fcac2c6766285748b3e267
- Full Text :
- https://doi.org/10.1021/acs.jpclett.0c00757