Growth of large Cs2Cu(Cl, Br)4 single crystals

In this work, copper-based halides Cs 2 CuCl 4 , Cs 2 CuBr 4 and mixed-halides Cs 2 CuCl 2.8 Br 1.2 , Cs 2 CuCl 2 Br 2 and Cs 2 CuCl 1.2 Br 2.8 single crystals were grown via the evaporation method using deionized water as a solvent.