Highly Air-Stable Tin-Based Perovskite Solar Cells through Grain-Surface Protection by Gallic Acid

Tianyue Wang; Qidong Tai; Xuyun Guo; Jiupeng Cao; Chun Ki Liu; Naixiang Wang; Dong Shen; Ye Zhu; Chun Sing Lee; Feng Yan

doi:10.1021/acsenergylett.0c00526

Highly Air-Stable Tin-Based Perovskite Solar Cells through Grain-Surface Protection by Gallic Acid

Tianyue Wang, Qidong Tai, Xuyun Guo, Jiupeng Cao, Chun Ki Liu, Naixiang Wang, Dong Shen, Ye Zhu, Chun Sing Lee, Feng Yan

Research output: Journal article publication › Journal article › Academic research › peer-review

149 Citations (Scopus)

Abstract

Maintaining the stability of tin halide perovskites is a major challenge in developing lead-free perovskite solar cells (PSCs). Adding extra SnX2 (X = F, Cl, or Br) in the precursor solution to inhibit Sn2+ oxidation is an essential strategy to improve device efficiency and stability. However, SnX2 on the surface of perovskite grains tends to prohibit charge transfer across perovskite films. Here, we report a coadditive engineering approach by introducing antioxidant gallic acid (GA) together with SnCl2 to improve the performance of tin-based PSCs. The SnCl2-GA complex can not only protect the perovskite grains but also more effectively conduct electrons across it, leading to highly stable and efficient PSCs. The unencapsulated devices can maintain ∼80% of their initial efficiency after 1000 h of storage in ambient air with a relative humidity of 20%, which is the best air stability achieved in tin-based PSCs to date.

Original language	English
Pages (from-to)	1741-1749
Number of pages	9
Journal	ACS Energy Letters
Volume	5
Issue number	6
DOIs	https://doi.org/10.1021/acsenergylett.0c00526
Publication status	Published - 12 Jun 2020

ASJC Scopus subject areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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

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10.1021/acsenergylett.0c00526

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title = "Highly Air-Stable Tin-Based Perovskite Solar Cells through Grain-Surface Protection by Gallic Acid",

abstract = "Maintaining the stability of tin halide perovskites is a major challenge in developing lead-free perovskite solar cells (PSCs). Adding extra SnX2 (X = F, Cl, or Br) in the precursor solution to inhibit Sn2+ oxidation is an essential strategy to improve device efficiency and stability. However, SnX2 on the surface of perovskite grains tends to prohibit charge transfer across perovskite films. Here, we report a coadditive engineering approach by introducing antioxidant gallic acid (GA) together with SnCl2 to improve the performance of tin-based PSCs. The SnCl2-GA complex can not only protect the perovskite grains but also more effectively conduct electrons across it, leading to highly stable and efficient PSCs. The unencapsulated devices can maintain ∼80% of their initial efficiency after 1000 h of storage in ambient air with a relative humidity of 20%, which is the best air stability achieved in tin-based PSCs to date. ",

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AU - Wang, Tianyue

AU - Tai, Qidong

AU - Guo, Xuyun

AU - Cao, Jiupeng

AU - Liu, Chun Ki

AU - Wang, Naixiang

AU - Shen, Dong

AU - Zhu, Ye

AU - Lee, Chun Sing

AU - Yan, Feng

PY - 2020/6/12

Y1 - 2020/6/12

N2 - Maintaining the stability of tin halide perovskites is a major challenge in developing lead-free perovskite solar cells (PSCs). Adding extra SnX2 (X = F, Cl, or Br) in the precursor solution to inhibit Sn2+ oxidation is an essential strategy to improve device efficiency and stability. However, SnX2 on the surface of perovskite grains tends to prohibit charge transfer across perovskite films. Here, we report a coadditive engineering approach by introducing antioxidant gallic acid (GA) together with SnCl2 to improve the performance of tin-based PSCs. The SnCl2-GA complex can not only protect the perovskite grains but also more effectively conduct electrons across it, leading to highly stable and efficient PSCs. The unencapsulated devices can maintain ∼80% of their initial efficiency after 1000 h of storage in ambient air with a relative humidity of 20%, which is the best air stability achieved in tin-based PSCs to date.

AB - Maintaining the stability of tin halide perovskites is a major challenge in developing lead-free perovskite solar cells (PSCs). Adding extra SnX2 (X = F, Cl, or Br) in the precursor solution to inhibit Sn2+ oxidation is an essential strategy to improve device efficiency and stability. However, SnX2 on the surface of perovskite grains tends to prohibit charge transfer across perovskite films. Here, we report a coadditive engineering approach by introducing antioxidant gallic acid (GA) together with SnCl2 to improve the performance of tin-based PSCs. The SnCl2-GA complex can not only protect the perovskite grains but also more effectively conduct electrons across it, leading to highly stable and efficient PSCs. The unencapsulated devices can maintain ∼80% of their initial efficiency after 1000 h of storage in ambient air with a relative humidity of 20%, which is the best air stability achieved in tin-based PSCs to date.

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DO - 10.1021/acsenergylett.0c00526

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SN - 2380-8195

VL - 5

SP - 1741

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JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 6

ER -

Highly Air-Stable Tin-Based Perovskite Solar Cells through Grain-Surface Protection by Gallic Acid

Abstract

ASJC Scopus subject areas

UN SDGs

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