Targeted Distribution of Passivator for Polycrystalline Perovskite Light-Emitting Diodes with High Efficiency

Xuefeng Peng; Xiaohui Yang; Detao Liu; Ting Zhang; Ye Yang; Chaochao Qin; Feng Wang; Li Chen; Shibin Li

doi:10.1021/acsenergylett.1c01753

Targeted Distribution of Passivator for Polycrystalline Perovskite Light-Emitting Diodes with High Efficiency

Xuefeng Peng, Xiaohui Yang^*, Detao Liu, Ting Zhang, Ye Yang, Chaochao Qin^*, Feng Wang, Li Chen^*, Shibin Li^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

Although a variety of passivators have been researched to passivate the defects, sufficient defect passivation still remains a challenge to further elevate the efficiency of perovskite light emitting diodes (PeLEDs). Herein, we report that the BMIM+ ions of the 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid have effective passivation interaction to the Pb-related defects. And, the spontaneously formed targeted distribution of the BMIM+ ions on the crystal surface and film top surface of the polycrystalline perovskite layers well matches the defect site distribution, resulting in the defects being sufficiently passivated. As a result, sufficient defect passivation of ionic liquid enables the photoluminescence quantum yields (PLQYs) to reach 100% and the maximum external quantum efficiency (EQE) of the PeLEDs increased to 22.9%. This work initializes the selection of the promising ionic liquid passivators for high efficiency PeLEDs and highlights the critical role of the passivator spatial distribution for sufficient defect passivation.

Original language	English
Pages (from-to)	4187-4194
Number of pages	8
Journal	ACS Energy Letters
Volume	6
Issue number	12
DOIs	https://doi.org/10.1021/acsenergylett.1c01753
Publication status	Published - 10 Dec 2021
Externally published	Yes

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title = "Targeted Distribution of Passivator for Polycrystalline Perovskite Light-Emitting Diodes with High Efficiency",

abstract = "Although a variety of passivators have been researched to passivate the defects, sufficient defect passivation still remains a challenge to further elevate the efficiency of perovskite light emitting diodes (PeLEDs). Herein, we report that the BMIM+ ions of the 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid have effective passivation interaction to the Pb-related defects. And, the spontaneously formed targeted distribution of the BMIM+ ions on the crystal surface and film top surface of the polycrystalline perovskite layers well matches the defect site distribution, resulting in the defects being sufficiently passivated. As a result, sufficient defect passivation of ionic liquid enables the photoluminescence quantum yields (PLQYs) to reach 100% and the maximum external quantum efficiency (EQE) of the PeLEDs increased to 22.9%. This work initializes the selection of the promising ionic liquid passivators for high efficiency PeLEDs and highlights the critical role of the passivator spatial distribution for sufficient defect passivation.",

author = "Xuefeng Peng and Xiaohui Yang and Detao Liu and Ting Zhang and Ye Yang and Chaochao Qin and Feng Wang and Li Chen and Shibin Li",

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T1 - Targeted Distribution of Passivator for Polycrystalline Perovskite Light-Emitting Diodes with High Efficiency

AU - Peng, Xuefeng

AU - Yang, Xiaohui

AU - Liu, Detao

AU - Zhang, Ting

AU - Yang, Ye

AU - Qin, Chaochao

AU - Wang, Feng

AU - Chen, Li

AU - Li, Shibin

PY - 2021/12/10

Y1 - 2021/12/10

N2 - Although a variety of passivators have been researched to passivate the defects, sufficient defect passivation still remains a challenge to further elevate the efficiency of perovskite light emitting diodes (PeLEDs). Herein, we report that the BMIM+ ions of the 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid have effective passivation interaction to the Pb-related defects. And, the spontaneously formed targeted distribution of the BMIM+ ions on the crystal surface and film top surface of the polycrystalline perovskite layers well matches the defect site distribution, resulting in the defects being sufficiently passivated. As a result, sufficient defect passivation of ionic liquid enables the photoluminescence quantum yields (PLQYs) to reach 100% and the maximum external quantum efficiency (EQE) of the PeLEDs increased to 22.9%. This work initializes the selection of the promising ionic liquid passivators for high efficiency PeLEDs and highlights the critical role of the passivator spatial distribution for sufficient defect passivation.

AB - Although a variety of passivators have been researched to passivate the defects, sufficient defect passivation still remains a challenge to further elevate the efficiency of perovskite light emitting diodes (PeLEDs). Herein, we report that the BMIM+ ions of the 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid have effective passivation interaction to the Pb-related defects. And, the spontaneously formed targeted distribution of the BMIM+ ions on the crystal surface and film top surface of the polycrystalline perovskite layers well matches the defect site distribution, resulting in the defects being sufficiently passivated. As a result, sufficient defect passivation of ionic liquid enables the photoluminescence quantum yields (PLQYs) to reach 100% and the maximum external quantum efficiency (EQE) of the PeLEDs increased to 22.9%. This work initializes the selection of the promising ionic liquid passivators for high efficiency PeLEDs and highlights the critical role of the passivator spatial distribution for sufficient defect passivation.

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DO - 10.1021/acsenergylett.1c01753

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JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 12

ER -

Targeted Distribution of Passivator for Polycrystalline Perovskite Light-Emitting Diodes with High Efficiency

Abstract

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