Organohalide based perovskites have emerged as an important class of material for solar cell applications. Our perovskites precursors are useful for synthesizing mixed cation or anion perovskites needed for the optimization of the band gap, carrier diffusion length and power conversion efficiency of perovskites based solar cells.
Crystallise the hydrobromide from water or EtOH and dry it at 5mm over P2O5. Also recrystallise it four times from MeOH containing a few drops of conc HBr by addition of pet ether (b 60-70o), then dry it to constant weight over paraffin chips in vacuo [Gutbezahl & Grunwald J Am Chem Soc 75 559 1953]. It precipitates from EtOH solution on addition of Et2O, and the filtered solid is recrystallised from EtOH and dried in vacuo. [Buchanan et al. J Am Chem Soc 108 1537 1986, Beilstein 12 III 232.]
