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Inter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites : Critical role of the spacing cations

Zheng, Kaibo LU ; Chen, Yani; Sun, Yong; Chen, Junsheng LU ; Chábera, Pavel LU ; Schaller, Richard; Al-Marri, Mohammed J.; Canton, Sophie E. LU ; Liang, Ziqi and Pullerits, Toñu LU (2018) In Journal of Materials Chemistry A 6(15). p.6244-6250
Abstract

Photo-generated charge carrier dynamics in Ruddlesden-Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies. Both n-BA and iso-BA perovskites consist of mixed-phase 2D quantum wells with various layer thicknesses, where the photo-generated charges undergo inter-phase charge transfer from thinner quantum wells to thicker ones. By shortening the spacer from n-BA to iso-BA, the transfer rates are significantly increased, which can also diminish the charge accumulation in thin quantum wells induced by the unbalanced electron and hole charge transfer rates. Under high excitation intensity, the shorter... (More)

Photo-generated charge carrier dynamics in Ruddlesden-Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies. Both n-BA and iso-BA perovskites consist of mixed-phase 2D quantum wells with various layer thicknesses, where the photo-generated charges undergo inter-phase charge transfer from thinner quantum wells to thicker ones. By shortening the spacer from n-BA to iso-BA, the transfer rates are significantly increased, which can also diminish the charge accumulation in thin quantum wells induced by the unbalanced electron and hole charge transfer rates. Under high excitation intensity, the shorter spacing cation is found to further facilitate the energy transfer, which can compete with fast high-order carrier recombination and consequently improve the charge transfer efficiency. Intriguingly, we observe the existence of extra bulk 3D phases embedded within iso-BA perovskites, which can efficiently collect the confined charges within 2D phases and then transport them with faster carrier mobility and slower recombination rates.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry A
volume
6
issue
15
pages
7 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85045583950
ISSN
2050-7488
DOI
10.1039/c8ta01518j
language
English
LU publication?
yes
id
e2fbd705-d83e-4dcb-a015-298c99032ca5
date added to LUP
2018-04-27 15:11:27
date last changed
2019-03-19 03:53:51
@article{e2fbd705-d83e-4dcb-a015-298c99032ca5,
  abstract     = {<p>Photo-generated charge carrier dynamics in Ruddlesden-Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies. Both n-BA and iso-BA perovskites consist of mixed-phase 2D quantum wells with various layer thicknesses, where the photo-generated charges undergo inter-phase charge transfer from thinner quantum wells to thicker ones. By shortening the spacer from n-BA to iso-BA, the transfer rates are significantly increased, which can also diminish the charge accumulation in thin quantum wells induced by the unbalanced electron and hole charge transfer rates. Under high excitation intensity, the shorter spacing cation is found to further facilitate the energy transfer, which can compete with fast high-order carrier recombination and consequently improve the charge transfer efficiency. Intriguingly, we observe the existence of extra bulk 3D phases embedded within iso-BA perovskites, which can efficiently collect the confined charges within 2D phases and then transport them with faster carrier mobility and slower recombination rates.</p>},
  author       = {Zheng, Kaibo and Chen, Yani and Sun, Yong and Chen, Junsheng and Chábera, Pavel and Schaller, Richard and Al-Marri, Mohammed J. and Canton, Sophie E. and Liang, Ziqi and Pullerits, Toñu},
  issn         = {2050-7488},
  language     = {eng},
  month        = {01},
  number       = {15},
  pages        = {6244--6250},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Materials Chemistry A},
  title        = {Inter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites : Critical role of the spacing cations},
  url          = {http://dx.doi.org/10.1039/c8ta01518j},
  volume       = {6},
  year         = {2018},
}