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Issue 32, 2019
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Hybrid lead halide [(CH3)2NH2]PbX3 (X = Cl and Br) hexagonal perovskites with multiple functional properties

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We have been able to prepare two new lead halides with the formula DMAPbX3 (where DMA is dimethylammonium and X is Cl or Br), which display a 4H-hexagonal perovskite polytype, an unusual crystal structure in hybrid organic–inorganic perovskites. Both compounds experience a first-order phase transition, the chloride at ∼320 K and the bromide at ∼250 K, which involves two cooperative processes: an off-center shift of the lead cations and an order–disorder process of the DMA cations. Additionally, a sharp dielectric transition is associated with this structural transition in both hybrids. Both compounds are semiconductors with band gap values of 3.5 eV (X: Cl) and 3.0 eV (X: Br). Also, the LT-phase of the Br compound displays a broad red light photoluminescence (PL) emission (620 nm) and PLE excitation with the maximum at a soft UV wavelength (360 nm). This broadband emission and large Stokes-shifted PL seem to be related to a self-trapped exciton mechanism. Therefore, the uncommon 4H-hexagonal perovskite is a promising crystal structure for understanding and designing new hybrid materials with broad photoluminescent emission and dielectric properties.

Graphical abstract: Hybrid lead halide [(CH3)2NH2]PbX3 (X = Cl− and Br−) hexagonal perovskites with multiple functional properties

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The article was received on 01 Jul 2019, accepted on 22 Jul 2019 and first published on 23 Jul 2019

Article type: Paper
DOI: 10.1039/C9TC03543E
J. Mater. Chem. C, 2019,7, 10008-10018

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    Hybrid lead halide [(CH3)2NH2]PbX3 (X = Cl and Br) hexagonal perovskites with multiple functional properties

    A. García-Fernández, E. J. Juarez-Perez, J. M. Bermúdez-García, A. L. Llamas-Saiz, R. Artiaga, J. J. López-Beceiro, M. A. Señarís-Rodríguez, M. Sánchez-Andújar and S. Castro-García, J. Mater. Chem. C, 2019, 7, 10008
    DOI: 10.1039/C9TC03543E

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