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 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.
| Original language | English |
|---|---|
| Pages (from-to) | 6244-6250 |
| Number of pages | 7 |
| Journal | Journal of Materials Chemistry A |
| Volume | 6 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Jan 1 2018 |
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ASJC Scopus subject areas
- Chemistry(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
Inter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites : Critical role of the spacing cations. / Zheng, Kaibo; Chen, Yani; Sun, Yong; Chen, Junsheng; Chábera, Pavel; Schaller, Richard D; Al-Marri, Mohammed J.; Canton, Sophie E.; Liang, Ziqi; Pullerits, Toñu.
In: Journal of Materials Chemistry A, Vol. 6, No. 15, 01.01.2018, p. 6244-6250.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Inter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites
T2 - Critical role of the spacing cations
AU - Zheng, Kaibo
AU - Chen, Yani
AU - Sun, Yong
AU - Chen, Junsheng
AU - Chábera, Pavel
AU - Schaller, Richard D
AU - Al-Marri, Mohammed J.
AU - Canton, Sophie E.
AU - Liang, Ziqi
AU - Pullerits, Toñu
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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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UR - http://www.scopus.com/inward/citedby.url?scp=85045583950&partnerID=8YFLogxK
U2 - 10.1039/c8ta01518j
DO - 10.1039/c8ta01518j
M3 - Article
AN - SCOPUS:85045583950
VL - 6
SP - 6244
EP - 6250
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 15
ER -