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Entre pérovskites 2D et 3D : le d-MAPI

par jboucle -

Publication :
Lead and iodide deficient (CH3NH3)PbI3, d-MAPI : the bridge between 2D and 3D hybrid perovskites
Nicolas Mercier, Antonin Leblanc, Magali Allain, Jens Dittmer, Vincent Fernandez, Thierry Pauporté
Angewandte Chemie International Edition 2017, Advance article

Abstract
3D and 2D hybrid perovskites which are known for more than 20 years have emerged recently as promising materials for optoelectronic applications, particularly the 3D compound (CH3NH3)PbI3 (MAPI). Here, we report on the discovery of a new family of hybrid perovskites called d-MAPI : the association of PbI2 with both methyl ammonium (MA+) and hydroxyethyl ammonium (HEA+) cations leads to a series of five compounds whose general formulation is (MA)1-2.48x(HEA)3.48x[Pb1-xI3-x]. These materials which are lead and iodide deficient compared to MAPI, while keeping the 3D architecture, can be considered as a bridge between the 2D and 3D materials. Moreover, they can be prepared as crystallized thin films by spin-coating. These new 3D materials appear very promising for optoelectronic applications, not only because of their reduced lead content, but also in account of the large flexibility of their chemical composition through potential substitutions of MA+, HEA+, Pb2+ and I- ions.