Inter-phase charge and energy transfer in Ruddlesden–Popper 2D perovskites: critical role of the spacing cations
- Lund Univ., Lund (Sweden); Qatar Univ., Doha (Qatar)
- Fudan Univ., Shanghai (China)
- Lund Univ., Lund (Sweden)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- ELI-ALPS, ELI-HU Non-Profit Ltd., Szeged (Hungary); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Here, 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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Qatar National Research Fund (QNRF); Swedish Research Council (SRC); European Regional Development Fund (ERDF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1489254
- Alternate ID(s):
- OSTI ID: 1434137
- Journal Information:
- Journal of Materials Chemistry. A, Vol. 6, Issue 15; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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