[NH3(CH2)4NH3]SnX4 (X = Br, I): Dion-Jacobson type 2-D Perovskites with Short Interlayer Spacing
[NH3(CH2)4NH3]SnX4 (X = Br, I): Dion-Jacobson type 2-D Perovskites with Short Interlayer Spacing
Two-dimensional tin(II) halide perovskites stand as an environmentally benign alternative to Pb(II) halide perovskites. However, they are often challenging to make due to the oxidation of Sn(II) ion to more stable Sn(IV) ion. Here we report hybrid tin bromide and iodide perovskites: (1,4-BDA)Sn(IV)Br6 and (1,4-BDA)Sn(II)X4 (where X = Br, I; 1,4-BDA = 1,4-diammoniumbutane) with 0D and 2D structures, respectively. Their synthesis, structural characterization and photophysical properties are reported. They show bandgaps in the 1.94–2.70 eV range.
Structurally characterized 2-dimensional perovskites (1,4-BDA)SnIIBr4 and (1,4-BDA)SnIII4 are reported with the interlayer gap of ~ 10 Å. They are synthesized as phase pure materials in aqueous medium by suppressing the formation of SnIV impurities.
