Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots

Rui An; Fengying Zhang; Xianshao Zou; Yingying Tang; Mingli Liang; Ihor Oshchapovskyy; Yuchen Liu; Alireza Honarfar; Yunqian Zhong; Chuanshuai Li; Huifang Geng; Junsheng Chen; Sophie E. Canton; Tonu Pullerits; Kaibo Zheng

doi:10.1021/acsami.8b14480

Photostability and Photodegradation Processes in Colloidal CsPbI₃ Perovskite Quantum Dots

Rui An, Fengying Zhang, Xianshao Zou, Yingying Tang, Mingli Liang, Ihor Oshchapovskyy, Yuchen Liu, Alireza Honarfar, Yunqian Zhong, Chuanshuai Li, Huifang Geng, Junsheng Chen, Sophie E. Canton, Tonu Pullerits, Kaibo Zheng

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

Abstract

All-inorganic CsPbI₃ perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. Here, we studied the photostability of as-obtained colloidal CsPbI₃ QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI₃ QDs. Steady-state spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and transient absorption spectroscopy verified that light illumination leads to detachment of the capping agent, collapse of the CsPbI₃ QD surface, and finally aggregation of surface Pb⁰. Both dangling bonds containing surface and Pb⁰ serve as trap states causing PL quenching with a dramatic decrease of PL quantum yield. Our work provides a detailed insight about the correlation between the structural and photophysical consequences of the photodegradation process in CsPbI₃ QDs and may lead to the optimization of such QDs toward device applications.

Original language	English
Pages (from-to)	39222-39227
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	45
DOIs	https://doi.org/10.1021/acsami.8b14480
Publication status	Published - 2018 Nov 14

Subject classification (UKÄ)

Materials Chemistry
Physical Chemistry (including Surface- and Colloid Chemistry)
Condensed Matter Physics (including Material Physics, Nano Physics)

Free keywords

blue-shift emission
light illumination
photodegradation mechanism
surface collapse
trap states

Access to Document

10.1021/acsami.8b14480

1 Doctoral Thesis (compilation)

Charge Carrier Dynamics in Novel Solar Materials: Ultrafast Spectroelectrochemistry
Honarfar, A., 2021 Jan 12, Lund: MediaTryck Lund. 207 p.
Research output: Thesis › Doctoral Thesis (compilation)

Cite this

@article{50e24e7ceace492080240e7510a20bca,

title = "Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots",

abstract = "All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. Here, we studied the photostability of as-obtained colloidal CsPbI3 QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI3 QDs. Steady-state spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and transient absorption spectroscopy verified that light illumination leads to detachment of the capping agent, collapse of the CsPbI3 QD surface, and finally aggregation of surface Pb0. Both dangling bonds containing surface and Pb0 serve as trap states causing PL quenching with a dramatic decrease of PL quantum yield. Our work provides a detailed insight about the correlation between the structural and photophysical consequences of the photodegradation process in CsPbI3 QDs and may lead to the optimization of such QDs toward device applications.",

keywords = "blue-shift emission, light illumination, photodegradation mechanism, surface collapse, trap states",

author = "Rui An and Fengying Zhang and Xianshao Zou and Yingying Tang and Mingli Liang and Ihor Oshchapovskyy and Yuchen Liu and Alireza Honarfar and Yunqian Zhong and Chuanshuai Li and Huifang Geng and Junsheng Chen and Canton, {Sophie E.} and Tonu Pullerits and Kaibo Zheng",

year = "2018",

month = nov,

day = "14",

doi = "10.1021/acsami.8b14480",

language = "English",

volume = "10",

pages = "39222--39227",

journal = "ACS Applied Materials and Interfaces",

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publisher = "The American Chemical Society (ACS)",

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T1 - Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots

AU - An, Rui

AU - Zhang, Fengying

AU - Zou, Xianshao

AU - Tang, Yingying

AU - Liang, Mingli

AU - Oshchapovskyy, Ihor

AU - Liu, Yuchen

AU - Honarfar, Alireza

AU - Zhong, Yunqian

AU - Li, Chuanshuai

AU - Geng, Huifang

AU - Chen, Junsheng

AU - Canton, Sophie E.

AU - Pullerits, Tonu

AU - Zheng, Kaibo

PY - 2018/11/14

Y1 - 2018/11/14

N2 - All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. Here, we studied the photostability of as-obtained colloidal CsPbI3 QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI3 QDs. Steady-state spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and transient absorption spectroscopy verified that light illumination leads to detachment of the capping agent, collapse of the CsPbI3 QD surface, and finally aggregation of surface Pb0. Both dangling bonds containing surface and Pb0 serve as trap states causing PL quenching with a dramatic decrease of PL quantum yield. Our work provides a detailed insight about the correlation between the structural and photophysical consequences of the photodegradation process in CsPbI3 QDs and may lead to the optimization of such QDs toward device applications.

AB - All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted intense attention for their successful application in photovoltaics (PVs) and optoelectronics that are enabled by their superior absorption capability and great photoluminescence (PL) properties. However, their photostability remains a practical bottleneck and further optimization is highly desirable. Here, we studied the photostability of as-obtained colloidal CsPbI3 QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI3 QDs. Steady-state spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and transient absorption spectroscopy verified that light illumination leads to detachment of the capping agent, collapse of the CsPbI3 QD surface, and finally aggregation of surface Pb0. Both dangling bonds containing surface and Pb0 serve as trap states causing PL quenching with a dramatic decrease of PL quantum yield. Our work provides a detailed insight about the correlation between the structural and photophysical consequences of the photodegradation process in CsPbI3 QDs and may lead to the optimization of such QDs toward device applications.

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KW - surface collapse

KW - trap states

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