2021
DOI: 10.1002/adma.202103268
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Perovskite Light‐Emitting Diodes with EQE Exceeding 28% through a Synergetic Dual‐Additive Strategy for Defect Passivation and Nanostructure Regulation

Abstract: Quasi‐2D perovskites have long been considered to have favorable “energy funnel/cascade” structures and excellent optical properties compared with their 3D counterparts. However, most quasi‐2D perovskite light‐emitting diodes (PeLEDs) exhibit high external quantum efficiency (EQE) but unsatisfactory operating stability due to Auger recombination induced by high current density. Herein, a synergetic dual‐additive strategy is adopted to prepare perovskite films with low defect density and high environmental stab… Show more

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Cited by 422 publications
(354 citation statements)
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“…7c). Qi et al 125 used 18-crown-6 and poly(ethylene glycol) methyl ether acrylate (MPEG-MAA) as additives for the perovskite films, which coordinated with Pb 2+ and suppressed the selfaggregation of phenylbutylammonium bromide (PEABr). Consequently, the structure conversion from quasi-2D into nanocrystalline perovskite was prevented and low defect density and high environmental stability were realized (Fig.…”
Section: Please Do Not Adjust Marginsmentioning
confidence: 99%
“…7c). Qi et al 125 used 18-crown-6 and poly(ethylene glycol) methyl ether acrylate (MPEG-MAA) as additives for the perovskite films, which coordinated with Pb 2+ and suppressed the selfaggregation of phenylbutylammonium bromide (PEABr). Consequently, the structure conversion from quasi-2D into nanocrystalline perovskite was prevented and low defect density and high environmental stability were realized (Fig.…”
Section: Please Do Not Adjust Marginsmentioning
confidence: 99%
“…[7][8][9][10][11] Among neutral additives, small molecules containing -NH 2 , CÀ OÀ C, C=O, P=O functional groups have been studied. [12][13][14][15][16][17][18][19] For example, amine-functionalized molecular additives were demonstrated to increase the defect passivation effect by reducing the hydrogen bonding between -NH 2 group and FA + (FA, formamidinium). [12] Recently, fluorinated triphenylphosphine oxide (TFPPO) with a P=O group chemically coordinating with unsaturated Pb was reported to suppress defects.…”
mentioning
confidence: 99%
“…Introduction of additives is an important strategy to improve the device efficiency of PeLEDs, and they can be divided into ionic and neutral ones [7–11] . Among neutral additives, small molecules containing ‐NH 2 , C−O−C, C=O, P=O functional groups have been studied [12–19] . For example, amine‐functionalized molecular additives were demonstrated to increase the defect passivation effect by reducing the hydrogen bonding between ‐NH 2 group and FA + (FA, formamidinium) [12] .…”
Section: Figurementioning
confidence: 99%