Super-Resolution Luminescence Microspectroscopy Reveals the Mechanism of Photoinduced Degradation in CH3NH3PbI3 Perovskite Nanocrystals
Merdasa, Aboma LU ; Bag, Monojit LU ; Tian, Yuxi LU ; Källman, Elin ; Dobrovolsky, Alexander LU and Scheblykin, Ivan LU
(2016)
In Journal of Physical Chemistry C
120(19).
p.10711-10719
- Abstract
- Photoinduced degradation of individual methylammonium lead triiodide (MAPbI3) perovskite nanocrystals was studied using super-resolution luminescence microspectroscopy under intense light excitation. The photoluminescence (PL) intensity decrease and blue-shift of the PL spectrum up to 60 nm together with spatial shifts in the emission localization position up to a few hundred nanometers were visualized in real time. PL blinking was found to temporarily suspend the degradation process, indicating that the degradation needs a high concentration of mobile photogenerated charges to occur. We propose that the mechanistic process of degradation occurs as the three-dimensional MAPbI3 crystal structure smoothly collapses to the two-dimensional... (More)
- Photoinduced degradation of individual methylammonium lead triiodide (MAPbI3) perovskite nanocrystals was studied using super-resolution luminescence microspectroscopy under intense light excitation. The photoluminescence (PL) intensity decrease and blue-shift of the PL spectrum up to 60 nm together with spatial shifts in the emission localization position up to a few hundred nanometers were visualized in real time. PL blinking was found to temporarily suspend the degradation process, indicating that the degradation needs a high concentration of mobile photogenerated charges to occur. We propose that the mechanistic process of degradation occurs as the three-dimensional MAPbI3 crystal structure smoothly collapses to the two-dimensional layered PbI2 structure. The degradation starts locally and then spreads over the whole crystal. The structural collapse is primarily due to migration of methylammonium ions (MA+), which distorts the lattice structure causing alterations to the Pb–I–Pb bond angle and in turn changes the effective band gap. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5938aa24-f515-4a85-89e1-a3e8bd633da0
- author
- Merdasa, Aboma
LU
; Bag, Monojit
LU
; Tian, Yuxi
LU
; Källman, Elin
; Dobrovolsky, Alexander
LU
and Scheblykin, Ivan
LU
- organization
- publishing date
- 2016-04-22
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- perovskite, photo-induced degradation, photophysics, blinking, super-resolution microscopy
- in
- Journal of Physical Chemistry C
- volume
- 120
- issue
- 19
- pages
- 9 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:84971225635
- wos:000376417500066
- ISSN
- 1932-7447
- DOI
- 10.1021/acs.jpcc.6b03512
- language
- English
- LU publication?
- yes
- id
- 5938aa24-f515-4a85-89e1-a3e8bd633da0
- date added to LUP
- 2017-01-10 12:16:11
- date last changed
- 2023-11-08 00:38:31
@article{5938aa24-f515-4a85-89e1-a3e8bd633da0,
abstract = {{Photoinduced degradation of individual methylammonium lead triiodide (MAPbI3) perovskite nanocrystals was studied using super-resolution luminescence microspectroscopy under intense light excitation. The photoluminescence (PL) intensity decrease and blue-shift of the PL spectrum up to 60 nm together with spatial shifts in the emission localization position up to a few hundred nanometers were visualized in real time. PL blinking was found to temporarily suspend the degradation process, indicating that the degradation needs a high concentration of mobile photogenerated charges to occur. We propose that the mechanistic process of degradation occurs as the three-dimensional MAPbI3 crystal structure smoothly collapses to the two-dimensional layered PbI2 structure. The degradation starts locally and then spreads over the whole crystal. The structural collapse is primarily due to migration of methylammonium ions (MA+), which distorts the lattice structure causing alterations to the Pb–I–Pb bond angle and in turn changes the effective band gap.}},
author = {{Merdasa, Aboma and Bag, Monojit and Tian, Yuxi and Källman, Elin and Dobrovolsky, Alexander and Scheblykin, Ivan}},
issn = {{1932-7447}},
keywords = {{perovskite; photo-induced degradation; photophysics; blinking; super-resolution microscopy}},
language = {{eng}},
month = {{04}},
number = {{19}},
pages = {{10711--10719}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Super-Resolution Luminescence Microspectroscopy Reveals the Mechanism of Photoinduced Degradation in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite Nanocrystals}},
url = {{http://dx.doi.org/10.1021/acs.jpcc.6b03512}},
doi = {{10.1021/acs.jpcc.6b03512}},
volume = {{120}},
year = {{2016}},
}