Structural evolution, optical gap and thermoelectric properties of CH₃NH₃SnBr₃ hybrid perovskite, prepared by mechanochemistry

Abstract

Direct bandgap semiconductors of the hybrid-perovskite family CH3NH3PbX3 (X= I, Br, Cl) exhibit outstanding light absorption properties and are the materials of choice for solar energy applications. As an alternative...

Detailed Structural Features of the Perovskite-Related Halide RbPbI3 for Solar Cell Applications

“…The combination of these parameters in the thermoelectric figure of merit, ZT ( S 2 σ T /κ), yields the result displayed in Figure b. This figure of merit is low compared to most thermoelectric materials, but at 523 K, it reaches 6 × 10 –4 , which is 2 orders of magnitude higher than the figure of merit reported for other halide perovskites, such as Bi-doped MAPbBr 3 , MASnBr 3 , and RbPb 2 Br 5 .…”

Mixed valence Sn doped (CH3NH3)3Bi2Br9 produced by mechanochemical synthesis

“…It is known that MASnBr 3 can be formed mechanochemically from SnBr 2 and MABr in inert conditions. 28 We attempted this reaction in air using the same procedure as used for synthesis of our doped MA 3 Bi 2 Br 9 . The result was a red powder, with XRD peaks matching cubic MASnBr 3 , and some small unidentified peaks that may be due to decomposition in air (Fig.…”

“…Mechanochemical reactions have been used as a synthesis strategy for a long time in many areas such as to prepare polymeric materials, 25 metal organic frameworks (MOFs) 26,27 and halide perovskites. 28 They have proven very successful for preparing conventional and vacancy ordered halide perovskites, 29 including MA 3 Bi 2 Br 9 . 30 Solvent-free mechanochemical reactions conducted by solid-state grinding, can be a sustainable synthesis approach.…”

A Review of Three-Dimensional Tin Halide Perovskites as Solar Cell Materials

“…Fine powders of tin precursors and methylammonium ( iodide, bromide and chloride) were ground in ball mill for the mechanochemical synthesis of tin perovskites 144,145 . The stability of the samples in air was improved by SnF 2 144,145 .…”