Correlations between Immobilizing Ions and Suppressing Hysteresis in Perovskite Solar Cells

Yicheng Zhao; Wenke Zhou; Wei Ma; Sheng Meng; Heng Li; Jing Wei; Rui Fu; Kaihui Liu; Dapeng Yu; Qing Zhao

doi:10.1021/acsenergylett.6b00060

Correlations between Immobilizing Ions and Suppressing Hysteresis in Perovskite Solar Cells

Yicheng Zhao, Wenke Zhou, Wei Ma, Sheng Meng, Heng Li, Jing Wei, Rui Fu, Kaihui Liu, Dapeng Yu, Qing Zhao^*

^*Corresponding author for this work

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

120 Citations (Scopus)

Abstract

Ion migration has been regarded as the major cause of photocurrent hysteresis. Here we use photoluminescence (PL) and optical images, combined with Galvanostatic measurement, to detect the ionic motion. We observe an irreversible PL and optical transmittance change after electric poling. By comparing a neat perovskite film with the sample coated by poly(methyl methacrylate) (PMMA), polyethylene glycol (PEG), and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we found that PCBM effectively inhibits ionic motion near the surface of the perovskite.We further evidenced the donor-acceptor complex formed between PCBM and perovskite, implying the mechanism of inhibited ion migration by PCBM. We close by demonstrating that PCBM can also be introduced on the top of perovskite fim in an n-i-p TiO₂ planar structure, to achieve an average 14% steady-state output over 2.3 × 10⁵ s (∼64 h). This work highlights the importance of inhibiting ionic motion in perovskite solar cells.

Original language	English
Pages (from-to)	266-272
Number of pages	7
Journal	ACS Energy Letters
Volume	1
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.6b00060
Publication status	Published - 8 Jul 2016
Externally published	Yes

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title = "Correlations between Immobilizing Ions and Suppressing Hysteresis in Perovskite Solar Cells",

abstract = "Ion migration has been regarded as the major cause of photocurrent hysteresis. Here we use photoluminescence (PL) and optical images, combined with Galvanostatic measurement, to detect the ionic motion. We observe an irreversible PL and optical transmittance change after electric poling. By comparing a neat perovskite film with the sample coated by poly(methyl methacrylate) (PMMA), polyethylene glycol (PEG), and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we found that PCBM effectively inhibits ionic motion near the surface of the perovskite.We further evidenced the donor-acceptor complex formed between PCBM and perovskite, implying the mechanism of inhibited ion migration by PCBM. We close by demonstrating that PCBM can also be introduced on the top of perovskite fim in an n-i-p TiO2 planar structure, to achieve an average 14% steady-state output over 2.3 × 105 s (∼64 h). This work highlights the importance of inhibiting ionic motion in perovskite solar cells.",

author = "Yicheng Zhao and Wenke Zhou and Wei Ma and Sheng Meng and Heng Li and Jing Wei and Rui Fu and Kaihui Liu and Dapeng Yu and Qing Zhao",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

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doi = "10.1021/acsenergylett.6b00060",

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T1 - Correlations between Immobilizing Ions and Suppressing Hysteresis in Perovskite Solar Cells

AU - Zhao, Yicheng

AU - Zhou, Wenke

AU - Ma, Wei

AU - Meng, Sheng

AU - Li, Heng

AU - Wei, Jing

AU - Fu, Rui

AU - Liu, Kaihui

AU - Yu, Dapeng

AU - Zhao, Qing

PY - 2016/7/8

Y1 - 2016/7/8

N2 - Ion migration has been regarded as the major cause of photocurrent hysteresis. Here we use photoluminescence (PL) and optical images, combined with Galvanostatic measurement, to detect the ionic motion. We observe an irreversible PL and optical transmittance change after electric poling. By comparing a neat perovskite film with the sample coated by poly(methyl methacrylate) (PMMA), polyethylene glycol (PEG), and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we found that PCBM effectively inhibits ionic motion near the surface of the perovskite.We further evidenced the donor-acceptor complex formed between PCBM and perovskite, implying the mechanism of inhibited ion migration by PCBM. We close by demonstrating that PCBM can also be introduced on the top of perovskite fim in an n-i-p TiO2 planar structure, to achieve an average 14% steady-state output over 2.3 × 105 s (∼64 h). This work highlights the importance of inhibiting ionic motion in perovskite solar cells.

AB - Ion migration has been regarded as the major cause of photocurrent hysteresis. Here we use photoluminescence (PL) and optical images, combined with Galvanostatic measurement, to detect the ionic motion. We observe an irreversible PL and optical transmittance change after electric poling. By comparing a neat perovskite film with the sample coated by poly(methyl methacrylate) (PMMA), polyethylene glycol (PEG), and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we found that PCBM effectively inhibits ionic motion near the surface of the perovskite.We further evidenced the donor-acceptor complex formed between PCBM and perovskite, implying the mechanism of inhibited ion migration by PCBM. We close by demonstrating that PCBM can also be introduced on the top of perovskite fim in an n-i-p TiO2 planar structure, to achieve an average 14% steady-state output over 2.3 × 105 s (∼64 h). This work highlights the importance of inhibiting ionic motion in perovskite solar cells.

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EP - 272

JO - ACS Energy Letters

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ER -

Correlations between Immobilizing Ions and Suppressing Hysteresis in Perovskite Solar Cells

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