Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells

Yani Chen; Yong Sun; Jiajun Peng; Pavel Chábera; Alireza Honarfar; Kaibo Zheng; Ziqi Liang

doi:10.1021/acsami.8b06256

Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells

Yani Chen, Yong Sun, Jiajun Peng, Pavel Chábera, Alireza Honarfar, Kaibo Zheng^*, Ziqi Liang

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Environmentally friendly tin (Sn)-based metallic halide perovskites suffer from oxidation and morphological issues. Here, we demonstrate the composition engineering of Pb-Sn-alloyed two-dimensional (2D) Ruddlesden-Popper perovskites, (BA)₂(MA)₃Pb_4-xSn_xI₁₃, for efficient and stable solar cell applications. Smooth thin films with high surface coverage are readily formed without using any additive owing to the self-assembly characteristic of 2D perovskites. It is found that Sn plays a significant role in improving the crystallization and crystal orientation while narrowing the bandgap of Pb-Sn 2D perovskites. Photophysical studies further reveal that the optimal Sn ratio (25 mol %) based sample exhibits both minimized trap density and weakened quantum confinement for efficient charge separation. Consequently, the optimized (BA)₂(MA)₃Pb₃SnI₁₃-based solar cells yield the best power conversion efficiency close to 6% with suppressed hysteresis.

Original language	English
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	25
Pages (from-to)	21343-21348
ISSN	1944-8244
DOIs	https://doi.org/10.1021/acsami.8b06256
Publication status	Published - 27 Jun 2018

Keywords

Composition engineering
Organic-inorganic hybrid perovskites
Planar solar cells
Tin-based perovskites
Two-dimensional

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title = "Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells",

abstract = "Environmentally friendly tin (Sn)-based metallic halide perovskites suffer from oxidation and morphological issues. Here, we demonstrate the composition engineering of Pb-Sn-alloyed two-dimensional (2D) Ruddlesden-Popper perovskites, (BA)2(MA)3Pb4-xSnxI13, for efficient and stable solar cell applications. Smooth thin films with high surface coverage are readily formed without using any additive owing to the self-assembly characteristic of 2D perovskites. It is found that Sn plays a significant role in improving the crystallization and crystal orientation while narrowing the bandgap of Pb-Sn 2D perovskites. Photophysical studies further reveal that the optimal Sn ratio (25 mol %) based sample exhibits both minimized trap density and weakened quantum confinement for efficient charge separation. Consequently, the optimized (BA)2(MA)3Pb3SnI13-based solar cells yield the best power conversion efficiency close to 6% with suppressed hysteresis.",

keywords = "Composition engineering, Organic-inorganic hybrid perovskites, Planar solar cells, Tin-based perovskites, Two-dimensional",

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T1 - Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells

AU - Chen, Yani

AU - Sun, Yong

AU - Peng, Jiajun

AU - Chábera, Pavel

AU - Honarfar, Alireza

AU - Zheng, Kaibo

AU - Liang, Ziqi

PY - 2018/6/27

Y1 - 2018/6/27

N2 - Environmentally friendly tin (Sn)-based metallic halide perovskites suffer from oxidation and morphological issues. Here, we demonstrate the composition engineering of Pb-Sn-alloyed two-dimensional (2D) Ruddlesden-Popper perovskites, (BA)2(MA)3Pb4-xSnxI13, for efficient and stable solar cell applications. Smooth thin films with high surface coverage are readily formed without using any additive owing to the self-assembly characteristic of 2D perovskites. It is found that Sn plays a significant role in improving the crystallization and crystal orientation while narrowing the bandgap of Pb-Sn 2D perovskites. Photophysical studies further reveal that the optimal Sn ratio (25 mol %) based sample exhibits both minimized trap density and weakened quantum confinement for efficient charge separation. Consequently, the optimized (BA)2(MA)3Pb3SnI13-based solar cells yield the best power conversion efficiency close to 6% with suppressed hysteresis.

AB - Environmentally friendly tin (Sn)-based metallic halide perovskites suffer from oxidation and morphological issues. Here, we demonstrate the composition engineering of Pb-Sn-alloyed two-dimensional (2D) Ruddlesden-Popper perovskites, (BA)2(MA)3Pb4-xSnxI13, for efficient and stable solar cell applications. Smooth thin films with high surface coverage are readily formed without using any additive owing to the self-assembly characteristic of 2D perovskites. It is found that Sn plays a significant role in improving the crystallization and crystal orientation while narrowing the bandgap of Pb-Sn 2D perovskites. Photophysical studies further reveal that the optimal Sn ratio (25 mol %) based sample exhibits both minimized trap density and weakened quantum confinement for efficient charge separation. Consequently, the optimized (BA)2(MA)3Pb3SnI13-based solar cells yield the best power conversion efficiency close to 6% with suppressed hysteresis.

KW - Composition engineering

KW - Organic-inorganic hybrid perovskites

KW - Planar solar cells

KW - Tin-based perovskites

KW - Two-dimensional

U2 - 10.1021/acsami.8b06256

DO - 10.1021/acsami.8b06256

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JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

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ER -

Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells

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