Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells

Chengjian Yuan; Mingqian Chen; Deng Wang; Jie Zeng; Jiarong Wang; Xiaofeng Huang; Kai-kai Liu; Tao Shen; Xia Lei; Ziyao Yue; Yiran Hao; Sai-Wing Tsang; Qin Hu; Baomin Xu; Alex K. -Y. Jen

doi:10.1021/acsenergylett.5c01995

Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells

Chengjian Yuan
, Mingqian Chen
, Deng Wang^*
, Jie Zeng
, Jiarong Wang
, Xiaofeng Huang
, Kai-kai Liu
, Tao Shen
, Xia Lei
, Ziyao Yue
, Yiran Hao
, Sai-Wing Tsang
, Qin Hu
, Baomin Xu
, Alex K. -Y. Jen^*

^*Corresponding author for this work

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

5 Citations (Scopus)

2 Downloads (CityUHK Scholars)

Abstract

Tin-lead (Sn-Pb) mixed perovskite solar cells (PSCs) emerge as essential subcells for all-perovskite tandem devices. However, their efficiency and stability are compromised by the facile oxidation of Sn²⁺ to Sn⁴⁺ and substantial defect density. In this work, we introduced tris(2-carboxyethyl) phosphine (TCEP) as a redox shuttle to accelerate the redox-reaction-enabled self-healing of Sn-Pb perovskite to recover its original state under illumination. Meanwhile, TCEP can regulate the crystallization kinetics due to the coordination interaction with metal cations, markedly enhancing the film quality. Benefiting from the multifunctionality of TCEP, the champion single-junction Sn-Pb PSC delivers an improved power conversion efficiency (PCE) of 23.86% while maintaining 90% of its initial PCE after 563 h of maximum power point tracking (MPPT) under illumination. Moreover, the all-perovskite tandem cell with TCEP exhibits a champion PCE of 28.86% and retains 80% of its initial PCE after 1000 h under continuous illumination.

© 2025 American Chemical Society

Original language	English
Pages (from-to)	4749–4757
Number of pages	9
Journal	ACS Energy Letters
Volume	10
Issue number	10
Online published	4 Sept 2025
DOIs	https://doi.org/10.1021/acsenergylett.5c01995
Publication status	Published - 10 Oct 2025

Funding

A.K.-Y.J. acknowledges the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science), and the support from the APRC Grants (9380086, 9610419, 9610440, 9610492, 9610508) of the City University of Hong Kong, the MHKJFS Grant (MHP/054/23), TCFS grant (GHP/121/22SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, and the GRF grants (11304424, 11307621, 11316422, 11308625) and CRS grants (CRS_CityU104/23, CRS_HKUST203/23) from the Research Grants Council of Hong Kong. This work was partially financially supported by City University of Hong Kong (9610739) for the project “Fostering Innovation for Resilience and Sustainable Transformation,” officially endorsed by the United Nations Educational, Scientific and Cultural Organization under the International Decade of Sciences for Sustainable Development (2024−2033).

UN SDGs

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

SDG 7 Affordable and Clean Energy

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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RGC-funded

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10.1021/acsenergylett.5c01995

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@article{717541aa9d8541389668d59dfb10a140,

title = "Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells",

abstract = "Tin-lead (Sn-Pb) mixed perovskite solar cells (PSCs) emerge as essential subcells for all-perovskite tandem devices. However, their efficiency and stability are compromised by the facile oxidation of Sn2+ to Sn4+ and substantial defect density. In this work, we introduced tris(2-carboxyethyl) phosphine (TCEP) as a redox shuttle to accelerate the redox-reaction-enabled self-healing of Sn-Pb perovskite to recover its original state under illumination. Meanwhile, TCEP can regulate the crystallization kinetics due to the coordination interaction with metal cations, markedly enhancing the film quality. Benefiting from the multifunctionality of TCEP, the champion single-junction Sn-Pb PSC delivers an improved power conversion efficiency (PCE) of 23.86\% while maintaining 90\% of its initial PCE after 563 h of maximum power point tracking (MPPT) under illumination. Moreover, the all-perovskite tandem cell with TCEP exhibits a champion PCE of 28.86\% and retains 80\% of its initial PCE after 1000 h under continuous illumination. {\textcopyright} 2025 American Chemical Society",

author = "Chengjian Yuan and Mingqian Chen and Deng Wang and Jie Zeng and Jiarong Wang and Xiaofeng Huang and Kai-kai Liu and Tao Shen and Xia Lei and Ziyao Yue and Yiran Hao and Sai-Wing Tsang and Qin Hu and Baomin Xu and Jen, \{Alex K. -Y.\}",

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language = "English",

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T1 - Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells

AU - Yuan, Chengjian

AU - Chen, Mingqian

AU - Wang, Deng

AU - Zeng, Jie

AU - Wang, Jiarong

AU - Huang, Xiaofeng

AU - Liu, Kai-kai

AU - Shen, Tao

AU - Lei, Xia

AU - Yue, Ziyao

AU - Hao, Yiran

AU - Tsang, Sai-Wing

AU - Hu, Qin

AU - Xu, Baomin

AU - Jen, Alex K. -Y.

PY - 2025/10/10

Y1 - 2025/10/10

N2 - Tin-lead (Sn-Pb) mixed perovskite solar cells (PSCs) emerge as essential subcells for all-perovskite tandem devices. However, their efficiency and stability are compromised by the facile oxidation of Sn2+ to Sn4+ and substantial defect density. In this work, we introduced tris(2-carboxyethyl) phosphine (TCEP) as a redox shuttle to accelerate the redox-reaction-enabled self-healing of Sn-Pb perovskite to recover its original state under illumination. Meanwhile, TCEP can regulate the crystallization kinetics due to the coordination interaction with metal cations, markedly enhancing the film quality. Benefiting from the multifunctionality of TCEP, the champion single-junction Sn-Pb PSC delivers an improved power conversion efficiency (PCE) of 23.86% while maintaining 90% of its initial PCE after 563 h of maximum power point tracking (MPPT) under illumination. Moreover, the all-perovskite tandem cell with TCEP exhibits a champion PCE of 28.86% and retains 80% of its initial PCE after 1000 h under continuous illumination. © 2025 American Chemical Society

AB - Tin-lead (Sn-Pb) mixed perovskite solar cells (PSCs) emerge as essential subcells for all-perovskite tandem devices. However, their efficiency and stability are compromised by the facile oxidation of Sn2+ to Sn4+ and substantial defect density. In this work, we introduced tris(2-carboxyethyl) phosphine (TCEP) as a redox shuttle to accelerate the redox-reaction-enabled self-healing of Sn-Pb perovskite to recover its original state under illumination. Meanwhile, TCEP can regulate the crystallization kinetics due to the coordination interaction with metal cations, markedly enhancing the film quality. Benefiting from the multifunctionality of TCEP, the champion single-junction Sn-Pb PSC delivers an improved power conversion efficiency (PCE) of 23.86% while maintaining 90% of its initial PCE after 563 h of maximum power point tracking (MPPT) under illumination. Moreover, the all-perovskite tandem cell with TCEP exhibits a champion PCE of 28.86% and retains 80% of its initial PCE after 1000 h under continuous illumination. © 2025 American Chemical Society

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U2 - 10.1021/acsenergylett.5c01995

DO - 10.1021/acsenergylett.5c01995

M3 - RGC 21 - Publication in refereed journal

SN - 2380-8195

VL - 10

SP - 4749

EP - 4757

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 10

ER -

Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells

Abstract

Funding

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GRF: Molecular Engineering of Polyoxometalate (POM) and Self-Assembled Monolayer (SAM) Composites for Improving Efficiency and Stability of Organic and Perovskite Solar Cells

GRF: Development of Multifunctional Redox Mediators to Mitigate Halide Segregation in Wide-Bandgap Perovskites for Perovskite Based Tandem Solar Cells

ITF: Development of Commercializable Perovskite-Organic Tandem Solar Cells with High Efficiency and Stability

Cite this

Redox Shuttle-Stabilized Tin-Lead Perovskites for All-Perovskite Tandem Solar Cells

Abstract

Funding

UN SDGs

Publisher's Copyright Statement

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

GRF: Molecular Engineering of Polyoxometalate (POM) and Self-Assembled Monolayer (SAM) Composites for Improving Efficiency and Stability of Organic and Perovskite Solar Cells

GRF: Development of Multifunctional Redox Mediators to Mitigate Halide Segregation in Wide-Bandgap Perovskites for Perovskite Based Tandem Solar Cells

ITF: Development of Commercializable Perovskite-Organic Tandem Solar Cells with High Efficiency and Stability

Cite this