Novel Lewis Base Cyclam Self-Passivation of Perovskites without an Anti-Solvent Process for Efficient Light-Emitting Diodes

ACS Applied Materials & Interfaces
Boning HanJizhong Song

Abstract

Metal halide perovskites have been focused as a candidate applied as a promising luminescent material for next-generation high-quality lighting and high-definition display. However, as perovskite films formed, high density of defects would be produced in solution processing inevitably, leading to low exciton recombination efficiency in light-emitting diodes (LEDs). Herein, a facile and novel self-passivation strategy to inhibit defect formation in perovskite films for constructing high-performance LEDs is developed. For the first time, we introduce 1,4,8,11-tetraazacyclotetradecane (cyclam) in perovskite precursor solution, and it spontaneously passivates defect states of CsPbBr3-based perovskites by coaction between amine and uncoordinated lead ions during spin-coating without an anti-solvent process. Furthermore, as a delocalized system, cyclam also possesses chemical properties that facilitate exciton transportation. The proposed passivation strategy boosts the external quantum efficiency from 1.25% (control device) to 16.24% (cyclam-passivated device). Furthermore, defect passivation is also conductive to reduce LED degradation paths and improve device stability as the extrapolated lifetime (T50) of LEDs at an initial brigh...Continue Reading

References

Jan 20, 2012·Nano Letters·David ZhitomirskyEdward H Sargent
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Oct 12, 2018·Advanced Materials·Jizhong SongHaibo Zeng
May 24, 2019·The Journal of Physical Chemistry Letters·Zhanhua Wei, Jun Xing
Jul 20, 2019·Nano Letters·Verena A HintermayrAlexander S Urban
Jul 25, 2019·ACS Applied Materials & Interfaces·Lianqi TangWei Huang
Jul 31, 2019·Nature·Toshinori MatsushimaChihaya Adachi
Sep 19, 2019·ACS Applied Materials & Interfaces·Chae Young LeeJang Hyuk Kwon

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