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
AU - Al-Marri, Mohammed J.
AU - Canton, Sophie E.
AU - Liang, Ziqi
AU - Pullerits, Toñu
N1 - Funding Information:
This 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 nancial 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-nanced by the European Regional Development Fund.
PY - 2018
Y1 - 2018
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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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 -