Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite

Abstract Wide bandgap perovskite solar cells (WB‐PSCs) sustained serious deficit of open‐circuit voltage (VOC) and instability in the development process, which limited the full play of their advantages, especially in tandem solar cells. Surface passivation engineering of alkyl amine halide salts ha...

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Main Authors: Xinghua Cui, Pengyang Wang, Biao Shi, Ying Zhao, Xiaodan Zhang
Format: Article
Language:English
Published: Wiley-VCH 2021-03-01
Series:Nano Select
Subjects:
Online Access:https://doi.org/10.1002/nano.202000183
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author Xinghua Cui
Pengyang Wang
Biao Shi
Ying Zhao
Xiaodan Zhang
author_facet Xinghua Cui
Pengyang Wang
Biao Shi
Ying Zhao
Xiaodan Zhang
author_sort Xinghua Cui
collection DOAJ
description Abstract Wide bandgap perovskite solar cells (WB‐PSCs) sustained serious deficit of open‐circuit voltage (VOC) and instability in the development process, which limited the full play of their advantages, especially in tandem solar cells. Surface passivation engineering of alkyl amine halide salts has been used extensively to improve the performance of PSCs. Here, the photovoltaic performance of FA0.83Cs0.17 Pb(I0.8Br0.2)3 WB‐PSCs based on methyl bromide (MABr) and bromide guanidine (GABr) passivation was systematically investigated. It was proved that both MABr and GABr significantly passivate the defects, resulting in lower trap density. Eventually, the efficiency arrives at 18.6% based on MABr‐treated perovskite film, and an improved VOC up to 1.235 V was obtained with a VOC‐deficit of only 415 mV, which is one of the highest value for the PSCs with 1.65 eV bandgap. It is noted that the devices treated with MABr exhibited enhanced moisture stability than that of the reference and GABr treated. X‐Ray Diffraction (XRD) revealed that GABr is likely to cause severer phase transition to δ‐phase nonperovskite. This paper provides an important insight to surface passivation strategies, both performance and stability in devices need to be considered simultaneously.
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spelling doaj.art-bd838ad75f81463f814aa8d1848f63192022-12-21T21:27:48ZengWiley-VCHNano Select2688-40112021-03-012361562310.1002/nano.202000183Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskiteXinghua Cui0Pengyang Wang1Biao Shi2Ying Zhao3Xiaodan Zhang4Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center Solar Energy Conversion Center Nankai University Tianjin P.R. ChinaInstitute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center Solar Energy Conversion Center Nankai University Tianjin P.R. ChinaInstitute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center Solar Energy Conversion Center Nankai University Tianjin P.R. ChinaInstitute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center Solar Energy Conversion Center Nankai University Tianjin P.R. ChinaInstitute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center Solar Energy Conversion Center Nankai University Tianjin P.R. ChinaAbstract Wide bandgap perovskite solar cells (WB‐PSCs) sustained serious deficit of open‐circuit voltage (VOC) and instability in the development process, which limited the full play of their advantages, especially in tandem solar cells. Surface passivation engineering of alkyl amine halide salts has been used extensively to improve the performance of PSCs. Here, the photovoltaic performance of FA0.83Cs0.17 Pb(I0.8Br0.2)3 WB‐PSCs based on methyl bromide (MABr) and bromide guanidine (GABr) passivation was systematically investigated. It was proved that both MABr and GABr significantly passivate the defects, resulting in lower trap density. Eventually, the efficiency arrives at 18.6% based on MABr‐treated perovskite film, and an improved VOC up to 1.235 V was obtained with a VOC‐deficit of only 415 mV, which is one of the highest value for the PSCs with 1.65 eV bandgap. It is noted that the devices treated with MABr exhibited enhanced moisture stability than that of the reference and GABr treated. X‐Ray Diffraction (XRD) revealed that GABr is likely to cause severer phase transition to δ‐phase nonperovskite. This paper provides an important insight to surface passivation strategies, both performance and stability in devices need to be considered simultaneously.https://doi.org/10.1002/nano.202000183perovskite solar cellsstabilitysurface passivationwide bandgap
spellingShingle Xinghua Cui
Pengyang Wang
Biao Shi
Ying Zhao
Xiaodan Zhang
Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
Nano Select
perovskite solar cells
stability
surface passivation
wide bandgap
title Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
title_full Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
title_fullStr Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
title_full_unstemmed Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
title_short Insights into the effect of bromine‐based organic salts on the efficiency and stability of wide bandgap perovskite
title_sort insights into the effect of bromine based organic salts on the efficiency and stability of wide bandgap perovskite
topic perovskite solar cells
stability
surface passivation
wide bandgap
url https://doi.org/10.1002/nano.202000183
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AT biaoshi insightsintotheeffectofbrominebasedorganicsaltsontheefficiencyandstabilityofwidebandgapperovskite
AT yingzhao insightsintotheeffectofbrominebasedorganicsaltsontheefficiencyandstabilityofwidebandgapperovskite
AT xiaodanzhang insightsintotheeffectofbrominebasedorganicsaltsontheefficiencyandstabilityofwidebandgapperovskite