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Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots

An, Rui; Zhang, Fengying LU ; Zou, Xianshao LU ; Tang, Yingying; Liang, Mingli; Oshchapovskyy, Ihor LU ; Liu, Yuchen LU ; Honarfar, Alireza LU ; Zhong, Yunqian and Li, Chuanshuai LU , et al. (2018) In ACS Applied Materials and Interfaces 10(45). p.39222-39227
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... (More)

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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publication status
published
subject
keywords
blue-shift emission, light illumination, photodegradation mechanism, surface collapse, trap states
in
ACS Applied Materials and Interfaces
volume
10
issue
45
pages
6 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85056528701
ISSN
1944-8244
DOI
10.1021/acsami.8b14480
language
English
LU publication?
yes
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50e24e7c-eace-4920-8024-0e7510a20bca
date added to LUP
2018-11-27 13:33:26
date last changed
2019-05-21 04:15:44
@article{50e24e7c-eace-4920-8024-0e7510a20bca,
  abstract     = {<p>All-inorganic CsPbI<sub>3</sub> 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 CsPbI<sub>3</sub> QDs suspended in hexane. We found that light illumination does induce photodegradation of CsPbI<sub>3</sub> 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 CsPbI<sub>3</sub> QD surface, and finally aggregation of surface Pb<sup>0</sup>. Both dangling bonds containing surface and Pb<sup>0</sup> 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 CsPbI<sub>3</sub> QDs and may lead to the optimization of such QDs toward device applications.</p>},
  author       = {An, Rui and Zhang, Fengying and Zou, Xianshao and Tang, Yingying and Liang, Mingli and Oshchapovskyy, Ihor and Liu, Yuchen and Honarfar, Alireza and Zhong, Yunqian and Li, Chuanshuai and Geng, Huifang and Chen, Junsheng and Canton, Sophie E. and Pullerits, Tonu and Zheng, Kaibo},
  issn         = {1944-8244},
  keyword      = {blue-shift emission,light illumination,photodegradation mechanism,surface collapse,trap states},
  language     = {eng},
  month        = {11},
  number       = {45},
  pages        = {39222--39227},
  publisher    = {The American Chemical Society},
  series       = {ACS Applied Materials and Interfaces},
  title        = {Photostability and Photodegradation Processes in Colloidal CsPbI<sub>3</sub> Perovskite Quantum Dots},
  url          = {http://dx.doi.org/10.1021/acsami.8b14480},
  volume       = {10},
  year         = {2018},
}