High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

Xuejie Zhu; Minyong Du; Jiangshan Feng; Hui Wang; Zhuo Xu; Likun Wang; Shengnan Zuo; Chenyu Wang; Ziyu Wang; Cong Zhang; Xiaodong Ren; Shashank Priya; Dong Yang; Shengzhong Liu

doi:10.1002/anie.202010987

High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

Xuejie Zhu, Minyong Du, Jiangshan Feng, Hui Wang, Zhuo Xu, Likun Wang, Shengnan Zuo, Chenyu Wang, Ziyu Wang, Cong Zhang, Xiaodong Ren, Shashank Priya, Dong Yang, Shengzhong Liu

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

267 Scopus citations

Abstract

Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF₆) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs_0.08FA_0.92PbI₃) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM]⁺ bonding with the Pb²⁺ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF₆-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF₆ layer blocked moisture permeation.

Original language	English (US)
Pages (from-to)	4238-4244
Number of pages	7
Journal	Angewandte Chemie - International Edition
Volume	60
Issue number	8
DOIs	https://doi.org/10.1002/anie.202010987
State	Published - Feb 19 2021

All Science Journal Classification (ASJC) codes

Catalysis
General Chemistry

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title = "High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport",

abstract = "Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs0.08FA0.92PbI3) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM]+ bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.",

author = "Xuejie Zhu and Minyong Du and Jiangshan Feng and Hui Wang and Zhuo Xu and Likun Wang and Shengnan Zuo and Chenyu Wang and Ziyu Wang and Cong Zhang and Xiaodong Ren and Shashank Priya and Dong Yang and Shengzhong Liu",

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doi = "10.1002/anie.202010987",

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T1 - High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

AU - Zhu, Xuejie

AU - Du, Minyong

AU - Feng, Jiangshan

AU - Wang, Hui

AU - Xu, Zhuo

AU - Wang, Likun

AU - Zuo, Shengnan

AU - Wang, Chenyu

AU - Wang, Ziyu

AU - Zhang, Cong

AU - Ren, Xiaodong

AU - Priya, Shashank

AU - Yang, Dong

AU - Liu, Shengzhong

PY - 2021/2/19

Y1 - 2021/2/19

N2 - Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs0.08FA0.92PbI3) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM]+ bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.

AB - Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs0.08FA0.92PbI3) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM]+ bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.

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JO - Angewandte Chemie - International Edition

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ER -

High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

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