Unravelling light-induced degradation of layered perovskite crystals and design of efficient encapsulation for improved photostability

Hong Hua Fang, Jie Yang, S.X. Tao, Sampson Adjokatse, Machteld Kamminga, Jianting Ye, Graeme Blake, Jacky Even, Maria Loi

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Abstract

Layered halide perovskites have recently shown extraordinary potential for clow-cost solution-processable optoelectronic applications because of their superior moisture stability over their 3D counterparts. However, few studies have investigated the effect of light on layered hybrid perovskites. Here, the mechanically exfoliated nanoflakes of the 2D perovskite (PEA)2PbI4 (PEA, 2-phenylethylammonium) are used as a model to investigate their intrinsic
photostability. The light-induced degradation of the flakes is investigated by using in situ techniques including confocal laser scanning microscopy,
wide-field fluorescence microscopy, and atomic force microscopy. Under resonant photoexcitation, (PEA)2PbI4 degrades to PbI2. It is clearly shown
that this process is initiated at the crystal edges and from the surface. As a consequence, the photoluminescence of (PEA)2PbI4 is progressively
quenched by surface traps. Importantly, the light-induced degradation can be suppressed by encapsulation using hexagonal boron nitride (hBN) flakes and/or polycarbonates. This report sheds light on a specific mechanism of light-induced degradation in layered perovskites and proposes a new
encapsulation method to improve their photostability.
Original languageEnglish
Article number1800305
Number of pages11
JournalAdvanced Functional Materials
Volume28
Issue number21
DOIs
Publication statusPublished - 2018

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Encapsulation
Perovskite
perovskites
degradation
Degradation
Crystals
polycarbonate
flakes
crystals
microscopy
Boron nitride
Photoexcitation
Fluorescence microscopy
polycarbonates
boron nitrides
Polycarbonates
photoexcitation
moisture
Optoelectronic devices
halides

Cite this

Fang, Hong Hua ; Yang, Jie ; Tao, S.X. ; Adjokatse, Sampson ; Kamminga, Machteld ; Ye, Jianting ; Blake, Graeme ; Even, Jacky ; Loi, Maria. / Unravelling light-induced degradation of layered perovskite crystals and design of efficient encapsulation for improved photostability. In: Advanced Functional Materials. 2018 ; Vol. 28, No. 21.
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abstract = "Layered halide perovskites have recently shown extraordinary potential for clow-cost solution-processable optoelectronic applications because of their superior moisture stability over their 3D counterparts. However, few studies have investigated the effect of light on layered hybrid perovskites. Here, the mechanically exfoliated nanoflakes of the 2D perovskite (PEA)2PbI4 (PEA, 2-phenylethylammonium) are used as a model to investigate their intrinsic photostability. The light-induced degradation of the flakes is investigated by using in situ techniques including confocal laser scanning microscopy, wide-field fluorescence microscopy, and atomic force microscopy. Under resonant photoexcitation, (PEA)2PbI4 degrades to PbI2. It is clearly shown that this process is initiated at the crystal edges and from the surface. As a consequence, the photoluminescence of (PEA)2PbI4 is progressively quenched by surface traps. Importantly, the light-induced degradation can be suppressed by encapsulation using hexagonal boron nitride (hBN) flakes and/or polycarbonates. This report sheds light on a specific mechanism of light-induced degradation in layered perovskites and proposes a new encapsulation method to improve their photostability.",
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Unravelling light-induced degradation of layered perovskite crystals and design of efficient encapsulation for improved photostability. / Fang, Hong Hua; Yang, Jie ; Tao, S.X.; Adjokatse, Sampson; Kamminga, Machteld; Ye, Jianting; Blake, Graeme; Even, Jacky; Loi, Maria.

In: Advanced Functional Materials, Vol. 28, No. 21, 1800305, 2018.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Unravelling light-induced degradation of layered perovskite crystals and design of efficient encapsulation for improved photostability

AU - Fang, Hong Hua

AU - Yang, Jie

AU - Tao, S.X.

AU - Adjokatse, Sampson

AU - Kamminga, Machteld

AU - Ye, Jianting

AU - Blake, Graeme

AU - Even, Jacky

AU - Loi, Maria

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N2 - Layered halide perovskites have recently shown extraordinary potential for clow-cost solution-processable optoelectronic applications because of their superior moisture stability over their 3D counterparts. However, few studies have investigated the effect of light on layered hybrid perovskites. Here, the mechanically exfoliated nanoflakes of the 2D perovskite (PEA)2PbI4 (PEA, 2-phenylethylammonium) are used as a model to investigate their intrinsic photostability. The light-induced degradation of the flakes is investigated by using in situ techniques including confocal laser scanning microscopy, wide-field fluorescence microscopy, and atomic force microscopy. Under resonant photoexcitation, (PEA)2PbI4 degrades to PbI2. It is clearly shown that this process is initiated at the crystal edges and from the surface. As a consequence, the photoluminescence of (PEA)2PbI4 is progressively quenched by surface traps. Importantly, the light-induced degradation can be suppressed by encapsulation using hexagonal boron nitride (hBN) flakes and/or polycarbonates. This report sheds light on a specific mechanism of light-induced degradation in layered perovskites and proposes a new encapsulation method to improve their photostability.

AB - Layered halide perovskites have recently shown extraordinary potential for clow-cost solution-processable optoelectronic applications because of their superior moisture stability over their 3D counterparts. However, few studies have investigated the effect of light on layered hybrid perovskites. Here, the mechanically exfoliated nanoflakes of the 2D perovskite (PEA)2PbI4 (PEA, 2-phenylethylammonium) are used as a model to investigate their intrinsic photostability. The light-induced degradation of the flakes is investigated by using in situ techniques including confocal laser scanning microscopy, wide-field fluorescence microscopy, and atomic force microscopy. Under resonant photoexcitation, (PEA)2PbI4 degrades to PbI2. It is clearly shown that this process is initiated at the crystal edges and from the surface. As a consequence, the photoluminescence of (PEA)2PbI4 is progressively quenched by surface traps. Importantly, the light-induced degradation can be suppressed by encapsulation using hexagonal boron nitride (hBN) flakes and/or polycarbonates. This report sheds light on a specific mechanism of light-induced degradation in layered perovskites and proposes a new encapsulation method to improve their photostability.

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