Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

Hengkai Zhang; Wei Yu; Junxue Guo; Chao Xu; Zhiwei Ren; Kuan Liu; Guang Yang; Minchao Qin; Jiaming Huang; Zhiliang Chen; Qiong Liang; Dong Shen; Zehan Wu; Yaokang Zhang; Hrisheekesh Thachoth Chandran; Jianhua Hao; Ye Zhu; Chun-sing Lee; Xinhui Lu; Zijian Zheng; Jinsong Huang; Gang Li

doi:10.1002/aenm.202201663

Excess PbI₂ Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

Hengkai Zhang, Wei Yu, Junxue Guo, Chao Xu, Zhiwei Ren, Kuan Liu, Guang Yang, Minchao Qin, Jiaming Huang, Zhiliang Chen, Qiong Liang, Dong Shen, Zehan Wu, Yaokang Zhang, Hrisheekesh Thachoth Chandran, Jianhua Hao, Ye Zhu, Chun-sing Lee, Xinhui Lu, Zijian ZhengJinsong Huang^*, Gang Li^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

72 Citations (Scopus)

Abstract

Excess PbI₂ in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI₂ is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI₂ (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI₂ is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).

Original language	English
Article number	2201663
Journal	Advanced Energy Materials
Volume	12
Issue number	35
Online published	28 Jul 2022
DOIs	https://doi.org/10.1002/aenm.202201663
Publication status	Published - 15 Sept 2022

Funding

G.L. thanks the support by Research Grants Council of Hong Kong (grant no. C7018-20G, C5037-18G, and GRF 15221320), Shenzhen Science and Technology Innovation Commission (Project no. JCYJ 20200109105003940), the Hong Kong Polytechnic University internal funds: Sir Sze-yuen Chung Endowed Professorship Fund (8-8480) and RISE Fund (Q-CDA5). G.L. thanks Dr. Bolong Huang's for the technical discussion of DFT part. Z.R. thanks PolyU Distinguished Postdoctoral Fellow Scheme (G-YWA9) support. K.L. thanks the Start-up Fund for RAPs under the Strategic Hiring Scheme (1-BD4G) provided by the Hong Kong Polytechnic University, and Guangdong Basic Research Foundation (2020A1515110156). W.Y. thanks the support by Dalian High-level Talents Innovation Support Program (2021RQ120).

Research Keywords

excess PbI2 management
ionic liquids
perovskite solar cells
IONIC LIQUID
HALIDE PEROVSKITES
STABILITY
ORGANIZATION
PASSIVATION
EFFICIENCY
SALTS

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Zhang, H., Yu, W., Guo, J., Xu, C., Ren, Z., Liu, K., Yang, G., Qin, M., Huang, J., Chen, Z., Liang, Q., Shen, D., Wu, Z., Zhang, Y., Chandran, H. T., Hao, J., Zhu, Y., Lee, C., Lu, X., ... Li, G. (2022). Excess PbI₂ Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells. Advanced Energy Materials, 12(35), Article 2201663. https://doi.org/10.1002/aenm.202201663

@article{ff78f786b0084487b2b3425230318183,

title = "Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells",

abstract = "Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI2 (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI2 is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).",

keywords = "excess PbI2 management, ionic liquids, perovskite solar cells, IONIC LIQUID, HALIDE PEROVSKITES, STABILITY, ORGANIZATION, PASSIVATION, EFFICIENCY, SALTS",

author = "Hengkai Zhang and Wei Yu and Junxue Guo and Chao Xu and Zhiwei Ren and Kuan Liu and Guang Yang and Minchao Qin and Jiaming Huang and Zhiliang Chen and Qiong Liang and Dong Shen and Zehan Wu and Yaokang Zhang and Chandran, {Hrisheekesh Thachoth} and Jianhua Hao and Ye Zhu and Chun-sing Lee and Xinhui Lu and Zijian Zheng and Jinsong Huang and Gang Li",

year = "2022",

month = sep,

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doi = "10.1002/aenm.202201663",

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Zhang, H, Yu, W, Guo, J, Xu, C, Ren, Z, Liu, K, Yang, G, Qin, M, Huang, J, Chen, Z, Liang, Q, Shen, D, Wu, Z, Zhang, Y, Chandran, HT, Hao, J, Zhu, Y, Lee, C, Lu, X, Zheng, Z, Huang, J & Li, G 2022, 'Excess PbI₂ Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells', Advanced Energy Materials, vol. 12, no. 35, 2201663. https://doi.org/10.1002/aenm.202201663

TY - JOUR

T1 - Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

AU - Zhang, Hengkai

AU - Yu, Wei

AU - Guo, Junxue

AU - Xu, Chao

AU - Ren, Zhiwei

AU - Liu, Kuan

AU - Yang, Guang

AU - Qin, Minchao

AU - Huang, Jiaming

AU - Chen, Zhiliang

AU - Liang, Qiong

AU - Shen, Dong

AU - Wu, Zehan

AU - Zhang, Yaokang

AU - Chandran, Hrisheekesh Thachoth

AU - Hao, Jianhua

AU - Zhu, Ye

AU - Lee, Chun-sing

AU - Lu, Xinhui

AU - Zheng, Zijian

AU - Huang, Jinsong

AU - Li, Gang

PY - 2022/9/15

Y1 - 2022/9/15

N2 - Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI2 (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI2 is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).

AB - Excess PbI2 in perovskite film is an effective strategy for boosting perovskite solar cells (PSCs) performance. However, the presence of unreacted PbI2 is a critical source of intrinsic instability in perovskite under illumination, due to the photolysis of PbI2 (decomposed into metallic lead and iodine). Herein, this issue is solved by applying ionic liquids (ILs) on PSCs where the ILs can form types of stable supramolecules with residual lead iodide. The formation process and mechanism of the supramolecules are elucidated. The residual PbI2 is also revealed to cause high level lead interstitial defects and induced tensile strain which further deteriorate device performance. The self-assembled supramolecular complex can passivate the PSCs where significant enhancements are achieved in both power conversion efficiency (PCE, from 21.9% to 23.4%) and device stability (retaining 95% of the initial PCE after 4080 h in ambient dry-air storage, and 80% after 1400 h continuous light illumination).

KW - excess PbI2 management

KW - ionic liquids

KW - perovskite solar cells

KW - IONIC LIQUID

KW - HALIDE PEROVSKITES

KW - STABILITY

KW - ORGANIZATION

KW - PASSIVATION

KW - EFFICIENCY

KW - SALTS

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DO - 10.1002/aenm.202201663

M3 - RGC 21 - Publication in refereed journal

SN - 1614-6832

VL - 12

JO - Advanced Energy Materials

JF - Advanced Energy Materials

IS - 35

M1 - 2201663

ER -

Excess PbI₂ Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

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Research Keywords

UN SDGs

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CRF: High Performance Photovoltaic Cells Integrating Perovskite and Polymers - Materials, Devices and Mechanism Studies

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Excess PbI2 Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells

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Research Keywords

UN SDGs

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CRF: High Performance Photovoltaic Cells Integrating Perovskite and Polymers - Materials, Devices and Mechanism Studies

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Excess PbI₂ Management via Multimode Supramolecular Complex Engineering Enables High-Performance Perovskite Solar Cells