@article{857ca74e-6879-44cd-bdd3-d47dfb9ba968,
  abstract     = {{Semiconductor heterostructures that combine components with different <br>
dimensionalities provide an interesting avenue to manipulate the <br>
physical properties of the resulting material. Two-dimensional lead <br>
halide perovskites crystallize as flat microcrystals and have efficient <br>
in-plane exciton mobility, while perovskite nanocrystals are efficient <br>
emitters with a tunable bandgap that can self-assemble into microscopic <br>
superlattices. However, combining such intricate architectures into <br>
heterostructures has been challenging due to the mismatch in solubility <br>
and difficult transfer procedures. Here, we realize heterostructures <br>
where CsPbBr<sub>3</sub> nanocrystal superlattices are deterministically grown along the faces of PEA<sub>2</sub>PbBr<sub>4</sub><br>
 2D layered perovskite microcrystals. The growth can either be limited <br>
to the lateral faces of the microcrystals and result in core–crown <br>
epitaxial heterostructures, or extended to the vertical direction <br>
leading to core–shell-like structures. We demonstrate that these <br>
heterostructures can be employed as efficient light-harvesting systems. <br>
In fact, energy can be transferred from the 2D microcrystal domain to <br>
the superlattices, enabling switching between linear and nonlinear <br>
carrier recombination regimes by tuning the excitation fluence. <br>
Moreover, by exploiting the lifetime shortening of CsPbBr<sub>3</sub> <br>
nanocrystal emission upon sample cooling, we ensure that energy transfer<br>
 occurs after the biexcitonic and single-excitonic decays of the <br>
nanocrystals, effectively extending the radiative life time of the <br>
superlattices.}},
  author       = {{Filippi, Umberto and Schleusener, Alexander and Lauciello, Simone and Krahne, Roman and Baranov, Dmitry and Manna, Liberato and Kuno, Masaru}},
  issn         = {{1521-4095}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Advanced Materials}},
  title        = {{Deterministic Nucleation of Nanocrystal Superlattices on 2D Perovskites for Light-Funneling Heterostructures}},
  url          = {{http://dx.doi.org/10.1002/adma.74290}},
  doi          = {{10.1002/adma.74290}},
  year         = {{2026}},
}