Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Octahedral distortion driven by CsPbI3nanocrystal reaction temperature-the effects on phase stability and beyond

Matuhina, Anastasia ; Grandhi, G. Krishnamurthy ; Liu, Maning LU orcid ; Smått, Jan Henrik ; Viswanath, N. S.M. ; Ali-Löytty, Harri ; Lahtonen, Kimmo and Vivo, Paola (2021) In Nanoscale 13(33). p.14186-14196
Abstract

Cesium lead iodide (CsPbI3) perovskite nanocrystals (NCs) suffer from a known transformation at room temperature from their red-emitting (black) to non-emitting (yellow) phase, induced by the tilting of PbI6 octahedra. While the reported attempts to stabilize CsPbI3 NCs mainly involve Pb2+-site doping as well as compositional and/or NC surface engineering, the black phase stability in relation only to the variation of the reaction temperature of CsPbI3 NCs is surprisingly overlooked. We report a holistic study of the phase stability of CsPbI3 NCs, encompassing dispersions, films, and even devices by tuning the hot-injection temperature between 120-170 °C. Our findings suggest that the transition from the black to the yellow phase occurs... (More)

Cesium lead iodide (CsPbI3) perovskite nanocrystals (NCs) suffer from a known transformation at room temperature from their red-emitting (black) to non-emitting (yellow) phase, induced by the tilting of PbI6 octahedra. While the reported attempts to stabilize CsPbI3 NCs mainly involve Pb2+-site doping as well as compositional and/or NC surface engineering, the black phase stability in relation only to the variation of the reaction temperature of CsPbI3 NCs is surprisingly overlooked. We report a holistic study of the phase stability of CsPbI3 NCs, encompassing dispersions, films, and even devices by tuning the hot-injection temperature between 120-170 °C. Our findings suggest that the transition from the black to the yellow phase occurs after over a month for NCs synthesized at 150 °C (150@NCs). Structural refinement studies attribute the enhanced stability of 150@NCs to their observed lowest octahedral distortion. The 150@NCs also lead to stable unencapsulated solar cells with unchanged performance upon 26 days of shelf storage in dry air. Our study underlines the importance of scrutinizing synthesis parameters for designing stable perovskite NCs towards long-lasting optoelectronic devices.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
13
issue
33
pages
11 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:34477700
  • scopus:85113996981
ISSN
2040-3364
DOI
10.1039/d1nr04071e
language
English
LU publication?
no
id
cb080cc9-2d95-429c-8d36-86193eeab71c
date added to LUP
2023-08-24 12:24:58
date last changed
2024-04-20 01:31:59
@article{cb080cc9-2d95-429c-8d36-86193eeab71c,
  abstract     = {{<p>Cesium lead iodide (CsPbI3) perovskite nanocrystals (NCs) suffer from a known transformation at room temperature from their red-emitting (black) to non-emitting (yellow) phase, induced by the tilting of PbI6 octahedra. While the reported attempts to stabilize CsPbI3 NCs mainly involve Pb2+-site doping as well as compositional and/or NC surface engineering, the black phase stability in relation only to the variation of the reaction temperature of CsPbI3 NCs is surprisingly overlooked. We report a holistic study of the phase stability of CsPbI3 NCs, encompassing dispersions, films, and even devices by tuning the hot-injection temperature between 120-170 °C. Our findings suggest that the transition from the black to the yellow phase occurs after over a month for NCs synthesized at 150 °C (150@NCs). Structural refinement studies attribute the enhanced stability of 150@NCs to their observed lowest octahedral distortion. The 150@NCs also lead to stable unencapsulated solar cells with unchanged performance upon 26 days of shelf storage in dry air. Our study underlines the importance of scrutinizing synthesis parameters for designing stable perovskite NCs towards long-lasting optoelectronic devices.</p>}},
  author       = {{Matuhina, Anastasia and Grandhi, G. Krishnamurthy and Liu, Maning and Smått, Jan Henrik and Viswanath, N. S.M. and Ali-Löytty, Harri and Lahtonen, Kimmo and Vivo, Paola}},
  issn         = {{2040-3364}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{33}},
  pages        = {{14186--14196}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Nanoscale}},
  title        = {{Octahedral distortion driven by CsPbI<sub>3</sub>nanocrystal reaction temperature-the effects on phase stability and beyond}},
  url          = {{http://dx.doi.org/10.1039/d1nr04071e}},
  doi          = {{10.1039/d1nr04071e}},
  volume       = {{13}},
  year         = {{2021}},
}