Elucidating mechanisms behind ambient storage-induced efficiency improvements in perovskite solar cells

Yongyoon Cho; Hyung Do  Kim; Jianghui Zheng; Jueming Bing; Yong Li; Meng Zhang; Martin A. Green; Atsushi wakamiya; Shujuan Huang; Hideo Ohkita; Anita W. Y. Ho-Baillie

doi:10.1021/acsenergylett.0c02406

Elucidating mechanisms behind ambient storage-induced efficiency improvements in perovskite solar cells

Yongyoon Cho, Hyung Do Kim, Jianghui Zheng, Jueming Bing, Yong Li, Meng Zhang, Martin A. Green, Atsushi wakamiya, Shujuan Huang, Hideo Ohkita^*, Anita W. Y. Ho-Baillie^*

^*Corresponding author for this work

School of Engineering

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent VOC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.

[Graphic presents]

Original language	English
Pages (from-to)	925-933
Number of pages	9
Journal	ACS Energy Letters
Volume	6
Issue number	3
Early online date	15 Feb 2021
DOIs	https://doi.org/10.1021/acsenergylett.0c02406
Publication status	Published - 12 Mar 2021

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title = "Elucidating mechanisms behind ambient storage-induced efficiency improvements in perovskite solar cells",

abstract = "Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent VOC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.[Graphic presents]",

author = "Yongyoon Cho and Kim, {Hyung Do} and Jianghui Zheng and Jueming Bing and Yong Li and Meng Zhang and Green, {Martin A.} and Atsushi wakamiya and Shujuan Huang and Hideo Ohkita and Ho-Baillie, {Anita W. Y.}",

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T1 - Elucidating mechanisms behind ambient storage-induced efficiency improvements in perovskite solar cells

AU - Cho, Yongyoon

AU - Kim, Hyung Do

AU - Zheng, Jianghui

AU - Bing, Jueming

AU - Li, Yong

AU - Zhang, Meng

AU - Green, Martin A.

AU - wakamiya, Atsushi

AU - Huang, Shujuan

AU - Ohkita, Hideo

AU - Ho-Baillie, Anita W. Y.

PY - 2021/3/12

Y1 - 2021/3/12

N2 - Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent VOC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.[Graphic presents]

AB - Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent VOC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.[Graphic presents]

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JO - ACS Energy Letters

JF - ACS Energy Letters

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Elucidating mechanisms behind ambient storage-induced efficiency improvements in perovskite solar cells

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