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@ARTICLE{Elshanawany:904100,
      author       = {Elshanawany, Mahmoud M. and Ricciardulli, Antonio Gaetano
                      and Saliba, Michael and Wachtveitl, Josef and Braun, Markus},
      title        = {{M}echanism of ultrafast energy transfer between the
                      organic–inorganic layers in multiple-ring aromatic spacers
                      for 2{D} perovskites},
      journal      = {Nanoscale},
      volume       = {13},
      issn         = {2040-3364},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2021-05670},
      pages        = {15668-15676},
      year         = {2021},
      abstract     = {Lead halide based perovskite semiconductors self-assemble
                      with distinct organic cations in natural multi-quantum-well
                      structures. The emerging electronic properties of these
                      two-dimensional (2D) materials can be controlled by the
                      combination of the halide content and choice of chromophore
                      in the organic layer. Understanding the photophysics of the
                      perovskite semiconductor materials is critical for the
                      optimization of stable and efficient optoelectronic devices.
                      We use femtosecond transient absorption spectroscopy
                      (fs-TAS) to study the mechanism of energy transfer between
                      the organic and inorganic layers in a series of three
                      lead-based mixed-halide perovskites such as benzylammonium
                      (BA), 1-naphthylmethylammonium (NMA), and
                      1-pyrenemethylammonium (PMA) cations in 2D-lead-based
                      perovskite thin films under similar experimental conditions.
                      After optical excitation of the 2D-confined exciton in the
                      lead halide layer, ultrafast energy transfer is observed to
                      organic singlet and triplet states of the incorporated
                      chromophores. This is explained by an effective Dexter
                      energy transfer, which operates via a correlated electron
                      exchange between the donating 2D-confined exciton and the
                      accepting chromophore under spin conservation.},
      cin          = {IEK-5},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {1212 - Materials and Interfaces (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1212},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34523656},
      UT           = {WOS:000695964700001},
      doi          = {10.1039/D1NR04290D},
      url          = {https://juser.fz-juelich.de/record/904100},
}