Principles of Melting in Hybrid Organic-Inorganic Perovskite and Polymorphic ABX3 Structures

Four novel dicyanamide-containing hybrid organic-inorganic ABX3 structures are reported, and the thermal behaviour of a series of nine perovskite and non-perovskite ABX3 structures in total are analysed. Structure-property relationships are investigated by varying both A-site organic and B-site transition metal cations. The introduction of larger tetraalkylammonium cations into the A-site reduces the melting temperature, and raises the Tolerance Factor. Total scattering methods are used to provide a greater understanding of the melting mechanism.