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Ambient fabrication of efficient triple cation perovskite-based near-infrared light-emitting diodes


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Guo, Xiaohang, Asuo, Ivy M., Pignolet, Alain, Nechache, Riad et Cloutier, Sylvain G.. 2022. « Ambient fabrication of efficient triple cation perovskite-based near-infrared light-emitting diodes ». Optical Materials Express, vol. 12, nº 1. pp. 153-165.

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In addition to their widespread use as an outstanding light-harvesting material, solution-based organometallic halide perovskites have also recently emerged as a promising material for light-emitting diode (LED) applications. However, their stability under an ambient environment remains a challenge. Triple cation perovskites offer an appealing solution as it reduces the sensitivity to the processing conditions and improves the purity of the perovskite films. This work describes a facile ambient-processed thiocyanate-doped triple-cation perovskite Csx(MA0.17FA0.83)Pb(100-x)(I0.83Br0.17)3 used for high-performance perovskite-based LEDs with peak emission at 750 nm. Using the perovskite film tailoring technique by mixing DMF (N,N-Dimethylmethanamide) with perovskite precursor, we are able to reduce the perovskite grain size and optimize the film thickness while preserving its crystalline structure. With optimized processing techniques, we achieve a ∼90% improvement of the perovskite LEDs external quantum efficiency (EQE) from ∼3.1% to ∼5.9%. We believe this triple cation perovskite synthesis approach and film tailoring technique yields excellent device performances and constitutes a significant step towards low-cost and efficient LEDs

Item Type: Peer reviewed article published in a journal
Cloutier, Sylvain G.
Affiliation: Génie électrique
Date Deposited: 24 Jan 2022 17:24
Last Modified: 03 Mar 2022 15:53

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