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

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132 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
Externally published	Yes

Bibliographical note

Funding Information:
Z.X. acknowledges support from the National Natural Science Foundation of China (61975106) and the Shaanxi Technical Innovation Guidance Project (2018HJCG‐17). S.L. acknowledges the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2016YFA0202403), the National University Research Fund (GK261001009), the Innovative Research Team (IRT_14R33), the 111 Project (B14041), the Chinese National 1000‐Talents‐Plan Program, and the Shanxi Science and Technology Department (20201101012). The unfunded collaborative work of S.P. and D.Y. was supported through the International Institute of Biosensing (IIB) headquartered at Penn State University.

Publisher Copyright:
© 2020 Wiley-VCH GmbH

Keywords

energy levels
ionic liquids
passivation
perovskites
stability

PubMed: MeSH publication types

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10.1002/anie.202010987

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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.",

keywords = "energy levels, ionic liquids, passivation, perovskites, stability",

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",

note = "Funding Information: Z.X. acknowledges support from the National Natural Science Foundation of China (61975106) and the Shaanxi Technical Innovation Guidance Project (2018HJCG‐17). S.L. acknowledges the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2016YFA0202403), the National University Research Fund (GK261001009), the Innovative Research Team (IRT_14R33), the 111 Project (B14041), the Chinese National 1000‐Talents‐Plan Program, and the Shanxi Science and Technology Department (20201101012). The unfunded collaborative work of S.P. and D.Y. was supported through the International Institute of Biosensing (IIB) headquartered at Penn State University. Publisher Copyright: {\textcopyright} 2020 Wiley-VCH GmbH",

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doi = "10.1002/anie.202010987",

language = "English (US)",

volume = "60",

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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

N1 - Funding Information: Z.X. acknowledges support from the National Natural Science Foundation of China (61975106) and the Shaanxi Technical Innovation Guidance Project (2018HJCG‐17). S.L. acknowledges the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2016YFA0202403), the National University Research Fund (GK261001009), the Innovative Research Team (IRT_14R33), the 111 Project (B14041), the Chinese National 1000‐Talents‐Plan Program, and the Shanxi Science and Technology Department (20201101012). The unfunded collaborative work of S.P. and D.Y. was supported through the International Institute of Biosensing (IIB) headquartered at Penn State University. Publisher Copyright: © 2020 Wiley-VCH GmbH

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.

KW - energy levels

KW - ionic liquids

KW - passivation

KW - perovskites

KW - stability

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DO - 10.1002/anie.202010987

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JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

SN - 1433-7851

IS - 8

ER -

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

Abstract

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