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AuthorZheng, Kaibo
AuthorChen, Yani
AuthorSun, Yong
AuthorChen, Junsheng
AuthorChábera, Pavel
AuthorSchaller, Richard
AuthorAl-Marri, Mohammed J.
AuthorCanton, Sophie E.
AuthorLiang, Ziqi
AuthorPullerits, Tõnu
Available date2023-02-02T04:34:11Z
Publication Date2018
Publication NameJournal of Materials Chemistry A
ResourceScopus
URIhttp://dx.doi.org/10.1039/c8ta01518j
URIhttp://hdl.handle.net/10576/39370
AbstractPhoto-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. 2018 The Royal Society of Chemistry.
SponsorThis work was made possible by NPRP grant #7-227-1-034 from the Qatar National Research Fund (a member of Qatar Foundation). Z.L. thanks the support from Inter-Governmental International Cooperation Projects of Science and Technology Commission of Shanghai Municipality (STCSM) under grant No. 17520710100. We also acknowledge financial support by the Swedish Research Council, KAW foundation, Swedish Energy Agency and STINT. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The ELI- ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund.
Languageen
PublisherRoyal Society of Chemistry
SubjectCharge transfer
Energy transfer
Perovskite
Photoluminescence spectroscopy
Positive ions
Carrier recombination
Charge accumulation
Charge carrier dynamics
Charge transfer efficiency
Excitation intensity
Thin quantum wells
Time resolved photoluminescence spectroscopies
Transient absorption
Semiconductor quantum wells
TitleInter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites: Critical role of the spacing cations
TypeArticle
Pagination6244-6250
Issue Number15
Volume Number6
dc.accessType Abstract Only


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