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Article Dans Une Revue Crystals Année : 2021

A 3D lead iodide hybrid based on a 2D perovskite subnetwork

M.B.H. Salah
  • Fonction : Auteur
J. Tessier
  • Fonction : Auteur
N. Mercier
  • Fonction : Auteur correspondant
M. Allain
  • Fonction : Auteur
A. Leblanc
  • Fonction : Auteur
Claudine Katan

Résumé

Lead halide perovskites have emerged as promising materials for various optoelectronic applications. For photovoltaics, the reference compound is the 3D perovskite (MA)PbI3 (MA+ = methylammonium). However, this material suffers from instabilities towards humidity or light. This makes the search of new stable 3D lead halide materials very relevant. A strategy is the use of intermediate size cations instead of MA, which are not suitable to form the 3D ABX3 perovskites or 2D perovskites. Here, we report on a novel 3D metal halide hybrid material based on the intermediate size cation hydroxypropylammonium (HPA+), (HPA)6 (MA)Pb5 I17. We will see that extending the carbon chain length from two CH2 units (in the hydroxylethylammonium cation, HEA+) to three (HPA+) precludes the formation of a perovskite network as found in the lead and iodide deficient perovskite (HEA,MA)1+xPbxI3−x. In (HPA)6 (MA)Pb5I17 the 3D lead halide network results from a 2D perovskite subnetworks linked by a PbI6 octahedra sharing its faces. DFT calculations confirm the direct band gap and reveal the peculiar band structure of this 3D network. On one hand the valence band has a 1D nature involving the p orbitals of the halide. On the other, the conduction band possesses a clear 2D character involving hybridization between the p orbitals of the metal and the halide. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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Chimie
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hal-03515123 , version 1 (02-06-2022)

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M.B.H. Salah, J. Tessier, N. Mercier, M. Allain, A. Leblanc, et al.. A 3D lead iodide hybrid based on a 2D perovskite subnetwork. Crystals, 2021, 11 (12), pp.1570. ⟨10.3390/cryst11121570⟩. ⟨hal-03515123⟩
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